Designed by riders, for riders. So you can ride more, experience more and adventure more.

Freedom to Travel

How to you feel about the idea of travelling twice as far on your bike for the same effort? Or how about a weekend away without the need for a car? Long-distance commuting without breaking a sweat? All of these (and more) are becoming possible with the advent of the e-bike.

The E-Adventure 1.0 650b was born to help you achieve this. We've been listening to devoted riders like you, and thinking on how best to make the most of this whole new way of riding. Having e-assist on a bike will enable all of us to explore more of the paths-less-travelled and make it easier for people to choose bike over car more often, which can only be a great thing.

New For 2021

Always wanting to improve the Cairn team took the award winning E-Adventure back to the drawing board to see how it could be improved further.

Bigger changes come in the form of the gravel specific GRX groupset from Shimano, braking from the hoods has never been so comfortable as well as confidence inspiring.

Increasing stand over on the frames has done a huge amount for off-road control and manoeuvrability, it also has opened up our bikes to smaller riders.

E-Adventure 1.0 650b 2021

The 650b version is ready for the more rowdy rider, if you want to take the more rugged path or even the odd trail centre then this bike is just the ticket. Using the same E-Adventure frame it comes equipped with 650b Hunt Adventure Sport rims on Hunt E-Gravel hub. Tyres are supplied by Vittoria with the Mezzcal 2.25” front and 2.1” rear tyres, the mix in sizing is something that the MTB fraternity have been doing for years and makes total sense on the front for better grip, more comfort and control. It also comes equipped with a Tranz-X dropper post (80mm drop) with drop bar remote, to allow easier weight shifts and control on steeper terrain, the remote can be easily accessed from the hoods or the drops.

Award Winning Design

The E-Adventure V1 took the UK cycling press by storm winning such accolades as the Cycling Weekly Editors Choice award, but always wanting to move forward, the Cairn team took the E-Adventure back to the drawing board to see how it could be improved further. .

See Full Details

Being devoted riders ourselves and listening to our existing customers allowed us to change simple things like cable guide positioning to clean up the lines as well as re-positioning the Fazua remote for easier control. Bigger changes come in the form of the gravel specific GRX groupset from Shimano, braking from the hoods has never been so comfortable as well as confidence inspiring. t

Cairn have teamed up again with Hunt to bring a specific wheel fit for the rigours that this bike was designed for.

The Adventure Sport Disc rims are renowned for their strength and low weight and these have been paired with Hunt’s E-Gravel hub that utilises a steel axle and increased pawl contact area for a longer lasting hub when used in ebikes.

Frame Improvements

Small changes can make a big impact on a riders experience, the V1 was a solid start but things can always be improved.

See Full Details

New internal cable routing gives cleaner lines, options for dropper post as well as lighting systems connected to the Fazua system, all kept clean and tidy.

Lower stand over gives greater control, more room to manoeuvre as well as allowing smaller riders to fit on our bikes
Bridgeless seatstays give more compliance adding the comfort and control of the bike, but using our single sided plate mudguards can be mounted easily if you want.

The E-Adventure 1.0 650b 2021 comes equipped with the renowned class-beating FAZUA motor. The drive system has a two-sided torque measurement: meaning the more power you bring to the crank, the more support you get back. With an average range of 75 km (46 miles) with the battery at the medium level of support, you can reach up to 144 km (90 miles) on Breeze mode.

New for the E-Adventure 1.650b 2021is the re-positioning of the remote, allowing more for more control and ease of use whilst on the move.

Increased grip at the front and fast rolling at the back, its something that mountain bikers have been doing for years. The 650B version of the E-Adventure takes this on board.

See Full Details

Vittoria Mezcal 2.25 front and 2.1 rear tyres give you confidence inspiring grip and control in all weathers. The larger front tyre also acts to dampen the worst of the impacts giving the rider the ability to choose the tougher lines. Tubeless ready and featuring high end spec like the use of Graphene in the compounds of the tread Vittoria are really at the next level of development in tyres..

Dropper Post

Having the saddle height correct for efficient pedalling is key to get the most from your legs and the bike, but on steep techy descents the saddle can be right where you don’t want it to be.

See Full Details

The Tranz-X dropper post with 70mm of travel means the efficient and comfortable saddle height for the flats and climbs can be used and when things point down and get rough the saddle can be dropped out of the way allowing you to get your weight back and be in control. The remote lever can be activated either from the drops or the hoods too.

Gravel bikes need a gravel specific groupset to give great shifting under power as well as powerful braking to keep you in control.

See Full Details

The Shimano GRX groupset is the only gravel specific groupset on the market, the gear shifts are crisp even when crunching through gears under load on climbs. The brakes are also hugely powerful with a gravel specific lever shape to give better braking from the hoods or the drops.

650b Full Specification

Frame

6061-T6 alloy with Top Tube integrated Fazua touch remote

Fork

Full Carbon with Anything mounts of both legs

Wheels

HUNT 650B Adventure Sport Disc Rim, Hunt E-Gravel Hub, Pillar Triple Butted Spokes

Tyres

Vittoria Mezcal 27.5" x 2.25" Front & 27.5 x 2.1" rear

Handlebar

Cairn Adventure 20 Degree Flare, 65mm Reach, 105mm Drop S - 44cm, M - 46cm, L - 48cm, XL - 50cm

Stem

Cairn Adventure 6061-T6 - S - 60mm, M - 70mm, L - 80mm, XL - 90mm

Bartape

Cairn Anti Slip Gravel

Crankset

Praxis Fazua Alloy w/42t Spider, S - 165mm, M/L - 170mm, XL - 172.5mm

Cassette

Sunrace CSMS7 11 speed 11-42T

Chain

KMC X11

Shifters

Shimano GRX ST-RX600-R & L for Single ring

Brake Calipers

Shimano GRX BR-RX400

Rear Mech

Shimano GRX RD-RX812

Rotors

Shimano SM-RT30 160mm

Saddle

Cairn E-Adventure Saddle 143mm

Seat Post

Tranz-X 70mm drop w/Dropbar compatible lever

Thru Axles

Cairn Alloy Thru Axle w/Removable Bottle Opener Handle

Other

Removeable rear mudguard bridge

Weight

15.5kg / 34lbs (w/ motor & battery, size Large)

Speed Limitations

UK/EU/ROW – All Cairn Bicycles sold in the UK/EU/ROW will be set to the maximum pedal-assisted speed limit of 15.5mph or 25kph.
US/NA – All Cairn Bicycles sold in North America will be set up per Class 1 status, allowing the bike to assist to 20mph or 32kph only when the rider is pedalling.

The lightest and most compact drive system in the industry!

For the E-Adventure we chose to partner with the amazing team at Fazua with their equally amazing Evation drive system. Its lightweight, integrated and natural pedal feel was exactly what we were looking for to complement our bikes. At only 4.6kg for the full system its helps to create a really lightweight ebike, furthermore the system has no mechanical resistance if not in use, so if the worst happens and you run out of battery it wont feel like riding a heavy bike through treacle like some other system. The battery its self though is just over 1kg and with the Cairn keg and cage you can easily carry another battery to further your exploration.

Cairn have also used the awesome new Black Pepper update (see below for more info) to create a Cairn E-Adventure tune, we believe these 3 modes best suit the terrain that you will encounter and will get the most from your bike and ride, its easy to switch back to the standard Fazua tune with a click of a button on the app.

You can now also connect your 3^rd party computers to the Evation drive, giving you loads more info, notably dual side power output of you the rider as well as the system – who doesn’t like seeing your watts.

More info on the Fazua Evation drive - https://fazua.com/en/drive-system/evation/

Three Different Riding Modes

Choose from three levels of assistance or pedal without any help, its that simple.

Breeze
Gentle, constant and 100 watts* like a strong tailwind even at low rider power.

River
Progressive and very sporty mode, for a smooth riding experience! The strength of the support precisely follows your own power. Give a lot - and get a lot from the motor (max. 210 watts*)

Rocket
Aggressive assistance that helps you to tackle the steepest (max. 250 watts*)

*default settings

Black Pepper Update

Fazua have updated the software of the Evation drive and labelled these changes as Black Pepper, so what do these changes bring to you?

Performance

The Evation drive system’s motor control was completely overhauled from the ground up. The result is a marked improvement in efficiency, making it possible to get even more performance from the compact unit.

Cadence range

One of the most clearly noticeable performance enhancements is the delivery of power over a broad cadence range. The Evation drive system now provides more efficient assistance at a constant motor output over a cadence range of 50–120 revolutions per minute.

Riding feel

From its inception, the Evation drive system has delivered a ride characterized by gentle, natural assistance. But now, riders can enjoy an even more authentic feel: In extensive biomechanical analyses, we used complex algorithms and methods to develop riding dynamics that perfectly adapt to the rider’s individual pedalling style—to guarantee the ideal level of assistance in every riding scenario.

How To Use The Drive System

700c

Spoilt for Choice - 700c or 650b?

650B

Gravel is such a broad term, and we realise this, one riders gravel ride is another’s mountain bike ride. This is why we came to conclusion we needed two version to give the choice to the rider; we have the fast paced 700c perfect for tarmac commutes with the ability to fly up the tow paths or farm trails for an adventure. If you like your gravel to be more chunky or thee destination for your ride is a MTB trail then the 650b version has you covered with big volume tyres supplying grip as well as comfort and the dropper post gives you the room to move when things point down.

We’ve broken the two bikes down to the points of difference below to help you choose which bike suits your adventure best.

Wheels

700c

HUNT 4 Season Gravel Disc X-Wide

The 6066-T6 aluminium rims with 25mm internal width makes the X-Wide wheels from HUNT highly durable and great for running 35C +tyres. They feature the new Hunt x Cairn E-Gravel hub with steel axle and larger surface engagement of the pawls to keep the wheels trouble free for longer. Find out more

650b

Mason x HUNT 650B Adventure Sport Disc

With a 25mm internal width, the Adventure Sport Disc wheels from HUNT are made for running wider tyres and the high spoke count makes them ideal for all kinds of terrain, even with a fully loaded bike. Find out more.

Tyres

700c

Vittoria Terreno Dry 38c

Fast-rolling and great on hard packed gravel with enough volume to take on the slightly rougher stuff. Featuring 3 different rubber compounds as well as utilising Graphene within the tyre this allows for a supper fast but confidence inspiring ride. Read all about the tyres here.

650b

Vittoria Mezcal 2.25" Front 2.1" Rear

The Vittoria Mezzcal 2.25” front and 2.1” rear tyres, the mix in sizing is something that the MTB fraternity have been doing for years and makes total sense, better grip, more comfort and control on the front and faster rolling on the rear.

Seat Post

700c

Kalloy Uno Rigid Carbon Seat Post

Lightweight carbon seat post to keeping overall weight down, carbon fibre is great for reducing vibrations from road buzz as well as having a bit of forgiving flex, letting you speed down those fire roads and gravel cycle paths in the saddle for longer.

650b

Tranz-X Dropper Post

The Tranz-X dropper with 80mm of drop allows the rider to not have compromise between efficient saddle height and comfort and control when riding off-road. Equipped with a remote control lever fitted under the left shifter, it enables you to have full control when you decide to go down that steep trail, then raise the saddle for the climbs with a flick of the remote.

700c Full Specification

Frame

6061-T6 alloy with Top Tube integrated Fazua touch remote

Fork

Full Carbon with Anything mounts of both legs

Wheels

HUNT 4 Seasnon Gravel X-Wide Rim, Hunt E-Gravel Hub, Pillar Triple Butted Spokes

Tyres

Vittoria Terreno Dry 700 x 38c

Handlebar

Ritchey Butano Comp S - 42cm, M/L - 44cm, XL - 46cm

Stem

Ritchey 4-Axis 44 7 degree. S - 70mm, M - 80mm, L - 90mm, XL - 100mm

Bartape

Fabric Knurl black

Crankset

Praxis Fazua Alloy w/42t Spider, S - 165mm, M/L - 170mm, XL - 172.5mm

Cassette

Shimano CS-M7000-11 speed 11-42t

Chain

KMC e11 Sport w/EPT coating

Shifters

Shimano GRX ST-RX600-R & L for Single ring

Brake Calipers

Shimano GRX BR-RX400

Rear Mech

Shimano GRX RD-RX812

Rotors

Shimano SM-RT64 160mm

Saddle

Fabric Scoop Elite Shallow

Seat Post

Cairn Carbon Seat post 27.2mm 350mm

Thru Axles

Cairn Alloy Thru Axle w/Removable Bottle Opener Handle

Other

Removeable rear mudguard bridge

Weight

15.1kg / 33.3lbs (w/ motor & battery, size Large)

650b Full Specification

Frame

6061-T6 alloy with Top Tube integrated Fazua touch remote

Fork

Full Carbon with Anything mounts of both legs

Wheels

HUNT 650B Adventure Sport Disc Rim, Hunt E-Gravel Hub, Pillar Triple Butted Spokes

Tyres

Vittoria Mezcal 27.5" x 2.25" Front & 27.5 x 2.1" rear

Handlebar

Cairn Adventure 20 Degree Flare, 65mm Reach, 105mm Drop S - 44cm, M - 46cm, L - 48cm, XL - 50cm

Stem

Cairn Adventure 6061-T6 - S - 60mm, M - 70mm, L - 80mm, XL - 90mm

Bartape

Cairn Anti Slip Gravel

Crankset

Praxis Fazua Alloy w/42t Spider, S - 165mm, M/L - 170mm, XL - 172.5mm

Cassette

Sunrace CSMS7 11 speed 11-42T

Chain

KMC X11

Shifters

Shimano GRX ST-RX600-R & L for Single ring

Brake Calipers

Shimano GRX BR-RX400

Rear Mech

Shimano GRX RD-RX812

Rotors

Shimano SM-RT30 160mm

Saddle

Cairn E-Adventure Saddle 143mm

Seat Post

Tranz-X 80mm drop w/Dropbar compatible lever

Thru Axles

Cairn Alloy Thru Axle w/Removable Bottle Opener Handle

Other

Removeable rear mudguard bridge

Weight

15.5kg / 34lbs (w/ motor & battery, size Large)

Sold out

Wheel Upgrades

You can add an extra set of Hunt Bike Wheels for 10% off, when purchased with your Cairn E-Adventure.

Sold out

FULL DETAILS

Sold out

FULL DETAILS

Sold out

FULL DETAILS

Bike Magazine & Website Expert's View

Cycling Weekly 2020 Editor's Choice

"The E-Adventure 1.0 is an incredibly likeable bike to ride. I can be pretty on the fence when it comes to e-bikes, preferring like many for my legs to be the main performance delivery system for my riding. But after the first ride I came away with the same sense of rewarded effort as if I had ridden a ‘normal’ gravel bike – but one that I managed to ride farther than my legs felt like they had ridden."

2021 Bicycling E-Bike Award

"With its impressively steady handling manners, reasonably smooth ride, and a plethora of mounts, the Cairn is best for going places—particularly on roads and paths less traveled."

Bike Perfect 4/5 Review

"I already liked Cairn’s E-Adventure bike, but having the motor mode switch right on the top tube and having more standover space are significant gains."

Cycling News Recommends 4.5/5 Review

"Cairn has taken the already somewhat niche electric gravel bike concept, sprinkled a little adventure dust on it and come up with one of the most versatile e-bikes around."

Cyclist Magazine Review

"A well considered e-gravel bike that now offers a choice of wheel configurations."

Bike Rumour 2019 Editor's Choice Award

"The most interesting e-bike I rode in 2019, was an e-gravel bike from Cairn. Propelled by a Fazua pedal-assist powertrain in the downtube, it strikes the perfect balance of giving just enough support to make the climbs a bit easier without every feeling like you are being pulled along. Comparing this back to back with a standard gravel bike on the same on & off-road loop, my heartrate was always just as high riding the Cairn, just my speed up every climb was noticeably faster. While most dropbar e-bike setups are literally a drag any time you get above their 25km/h limiter, the Fazua-powered Cairn was just as comfortable and natural feeling while pedaling at 20km/hr as it was at 40."

Singletrack Charged Full Review

'They produce products that they want to use, and the Cairn is a product of that: it’s a bike to replace a car, go to work the long way round, and throw in a bit of weekend adventure.'

BikeRadar E-Adventure 1.0 Review

"As well as changes to its geometry, other key improvements include an update to the motor, changes to cable routing and controller position, and wheel options and compatibility for a dropper to cater to more adventurous riders."

Road.cc First Look

"We caught up with the chaps from The Rider Firm at the Eurobike show. They’re the people behind Hunt bike wheels, but they were excited to show us something else they’ve been working on: a new gravel e-bike."

Find The Perfect Size

Finding the right size for your bike is crucial. Whilst every individual will have a slightly different bike fit preference, we strongly advise you to check the size chart below. Feedback from our customers states that it is a very good fit guide.

If you are still unsure, use the Smartfit size calculator to determine the best size for you. The calculations are based on scientific algorithms and data from 80,000 body measurements and more than a 100,000 bike model datasets.

Of course if you have any further questions please do get in touch with our friendly customer service team.

Size Chart

FIND YOUR SIZE

BOOK A TEST RIDE

60-Day Ride Guarantee

We understand that buying a new e-bike is a big decision. To help you with that, we are so confident that you'll be happy with your Cairn E-bike, that we offer a full 60 days to ride it. If at any point during these 60 days you wish to return it for a full refund (or a product swap) please complete our Technical Support form, or call us on the phone number at the foot of our website. Unfortunately, we cannot offer a refund on any item that has suffered severe or crash damage within this period. However, we do offer a crash replacement discount scheme, so please contact us via email or phone and we will help.

Warranty

Cairn Cycles warranty is only valid if it is purchased through Cairn Cycles or an authorised dealer. The warranty is void if your Cairn bicycle was not purchased direct or with an un-authorised dealer, if you are not the original owner, or it has been subject to non-normal use. Non-normal use conditions mean the bike has been subjected to tricks, stunts, skate parks, pump tracks, ramps, bike parks, north shore style, trials riding, commercial or hire activities. All riding should be done within the intended use of the bicycle, see intended uses page for more details. Warranty does not apply to normal wear and tear, abuse, neglect, improper assembly or maintenance as well as crash damage or non-original parts.

Complete Bicycle

All bikes will have a 1-year complete bicycle warranty, as long as the bicycle was purchase from Cairn Cycles direct or an authorised dealer. This will cover any defective materials or workmanship for one year from the date of purchase. This will be subject to condition and use within the intended us guidelines.

Frame

All Cairn Cycles frames will be covered for a period of 5 years from the date of purchase by the original owner. Subject to normal and intended use, regular maintenance and inspection by Cairn Cycles.

Fork

All Cairn Cycles forks (for suspension fork warranty please see the manufactures website or manual) will be covered for a period of 5 years from the date of purchase to the original owner. Subject to normal and intended use, regular maintenance and inspection by Cairn Cycles.

Wheels

All Hunt Bike Wheels are provided with a 3-year warranty against material or workmanship defects. The warranty period runs from the purchase date. For more information visit our help pages

Components

The individual components of your bicycle will have a warranty period as well, which is specific to the manufacture or the component. These will be either outlined in the provided manuals at point of purchase or the details can be found on the manufacturers

Ways to Buy

We are pleased to offer several ways to purchase your new bike. Choose between full payment, deposit only, finance or cyclescheme. Which ever suits you best.

Finance With Klarna

We're excited to announce we have partnered with Klarna to bring you new ways to pay at checkout. It's safe and simply way to get the bike you want, when you want it!

Find out More

Slice It (Finance) - 12, 24 or 36 months @ 9.9% APR (UK only)

Apply for monthly financing during checkout. It’s a simple, 2-step application process with an instant decision. When approved, you can manage your payments and get payment reminders in the Klarna App. Read more here.

Term	12 months	24 months	36 months
Spend	£262.06 per month	£137.21 per month	£95.72 per month
Total Amount Payable	£3,144.72	£3,293.04	£3,445.92
Interest Rate	9.90% Representative APR	9.90% Representative APR	9.90% Representative APR

*If you do not make your full monthly payment, the interest free arrangement will cease and you'll be required to pay interest on all future payments at 18.9% APR Representative. Missing payments can have serious consequences for you. Your credit rating may be affected which will make it more difficult or more expensive for you to obtain credit in the future.

ITS Cycling Limited is authorised and regulated by the Financial Conduct Authority (FCA FRN 798256) and acts as a credit intermediary and not a lender, offering credit products provided exclusively by Klarna Bank AB (publ). Finance is only available to permanent UK residents aged 18+, subject to status, terms and conditions apply.

ITS Cycling Ltd, 8 Huffwood, Partridge Green, RH13 8AU, United Kingdom

Klarna Bank AB (publ) is authorised by the Swedish Financial Supervisory Authority and subject to limited regulation by the Financial Conduct Authority and Prudential Regulation Authority. Details about the extent of this regulation by the Financial Conduct Authority and Prudential Regulation Authority are available from Klarna Bank AB (publ) on request.

Cyclescheme

We are delighted to announce that Cyclescheme is now available on Cairn Cycles.

Cyclescheme is the UK’s leading provider of tax-free bikes for the Government’s Cycle to Work initiative.

It’s a brilliant programme where everyone wins – employees make big savings on new bikes, whilst employers get a healthier, more motivated workforce and everyone enjoys significant savings. Find out more.

Deposit Option - Fully Refundable

If the bike is available to pre-order, we offer you the option to put down a small fully refundable deposit, which secures you the bike for the date that is shown.

If you choose to put down a deposit, we will contact you a few days before the bike arrives, so you can pay the remaining amount and get your new bike in time.

Product Availability

Don't miss out, order now - Please be aware that our bikes are in high demand due to their unique superior specifications. We are working hard to meet demand, but unfortunately sales often outstrip supply, so please order now to avoid disappointment.

The availability status below the "Add To Cart" button gives an indication of when delivery can be expected.

LIMITED STOCK

If wheels are showing LIMITED STOCK, we have small numbers for immediate dispatch from our UK warehouse. Please allow for 3-4 working days in order for us to fully prepare your bike for it's new adventure.

PRE-ORDER

If the bike you would like is currently unavailable, you are able to pre-order for delivery at the advertised date. See below for deposit options available.

PURPOSE

The 48 Limitless Aero Disc will come fully equipped with CeramicSpeed's industry-leading hybrid ceramic bearings, even in the freehub body.

Learn More

CeramicSpeed clearly need little introduction. We were honoured when they approached us last year to work together for the LIMITLESS project. As you know, CeramicSpeed bearings are renowned for their low rolling resistance, and are chosen by the top international athletes and teams.

All CeramicSpeed Balls are of the highest quality Grade 3 Silicon Nitride, featuring the highest achievable surface finish and roundness. The quality of the balls is what determines the performance and lifetime of a bearing. The CeramicSpeed Balls feature unparalleled impact strength, smoothness, roundness and brittleness.

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Freedom To Travel

Learn More

The Cairn E-Adventure 1.0 was born to help you achieve this. We've been listening to devoted riders like you, and thinking on how best make the most of this whole new way of riding. Having e-assist on a bike will enable all of us to explore more of the paths-less-travelled and make it easier for people to choose bike over car more often, which can only be a great thing.

Always wanting to improve the Cairn team took the award winning E-Adventure back to the drawing board to see how it could be improved further.

Learn More

Bigger changes come in the form of the gravel specific GRX groupset from Shimano, braking from the hoods has never been so comfortable as well as confidence inspiring.

Increasing stand over on the frames has done a huge amount for off-road control and manoeuvrability, it also has opened up our bikes to smaller riders.

New for 2021

E-Adventure 1.0 650b 2021

KEY SPECS

The Fastest Wheelset Is The Sum Of The Fastest Parts

Award Winning Design

See Full Details

Limitless Rims

Wind tunnel developed, features disc-specific, unidirectional T24/30 rims, offering 22.5mm internal and 35mm external widths, and a 48mm u-shape aero profile.

See Full Details

PATENTED LIMITLESS TECHNOLOGY

In order to create the most aerodynamic & stable shape for the tyre, a rim bed of 22.5mm is needed. With the tyre profile this creates, the ideal shape of the rim curves out to an external width of 35mm. To overcome the weight penalty associated with this, we use a (non-structural) low density expanding polymer insert, inside a channel carved out during pre-preg.

This is bonded to the carbon during the curing process, resulting in an exceptionally strong bond. The density of carbon is 1.6g per cubic centimetre, whereas the polymer insert weighs just 0.7g per cubic centimetre, resulting in a (rotational) mass loss of just over 50g per rim. This patented technology enables us to consider the limits of material properties, and smash right past them.

The Details

• Wind tunnel tested, aerodynamically optimised for 25-28c tyres.

• Disc-specific tubeless-ready profile.

• H-lock bead-seat up-kicks for easy and secure tubeless installation.

• Unidirectional T24/30 carbon fibre with 3K weave re-enforced spoke holes.

• Matt black base finished with matt white contrasting graphics.

HUNT Wheels

Cairn have teamed up again with HUNT to bring a specific wheel fit for the rigours that this bike was designed for.

Frame Improvements

Small changes can make a big impact on a riders experience, the V1 was a solid start but things can always be improved.

See Full Details

New internal cable routing gives cleaner lines, options for dropper post as well as lighting systems connected to the Fazua system, all kept clean and tidy.

Lower stand over gives greater control, more room to manoeuvre as well as allowing smaller riders to fit on our bikes

Bridgeless seatstays give more compliance adding the comfort and control of the bike, but using our single sided plate mudguards can be mounted easily if you want.

FAZUA

The E-Adventure 1.0 700c comes equipped with the renowned class-beating FAZUA motor. The drive system has a two-sided torque measurement: meaning the more power you bring to the crank, the more support you get back. With an average range of 75 km (46 miles) with the battery at the medium level of support, you can reach up to 144 km (90 miles) on Breeze mode.

New for the E-Adventure 1.0 700c is the re-positioning of the remote, allowing more for more control and ease of use whilst on the move.

Tyres

Increased grip at the front and fast rolling at the back, its something that mountain bikers have been doing for years. The 650B version of the E-Adventure takes this on board.

See Full Details

Dropper Post

Having the saddle height correct for efficient pedalling is key to get the most from your legs and the bike, but on steep techy descents the saddle can be right where you don’t want it to be.

See Full Details

Enter Tom Ritchey, from his pioneering days on the very first mountain bike trails to today, Tom does not settle for the norm. Everything Ritchey does has a unique feel and finish that sets it apart and nothing gets produced without approval from the man himself. The Ritchey Butano bar with its 118mm drop, 12 degree flare and 73mm reach will look pretty standard to most, Ritchey however adds a 4 degree back sweep and a much wider taper for extra comfort and compatibility with accessories and handlebar bags. Details like these make for a great finish to our bike.

Shimano GRX

Gravel bikes need a gravel specific groupset to give great shifting under power as well as powerful braking to keep you in control.

See Full Details

650b Full Specification

Frame

6061-T6 alloy with Top Tube integrated Fazua touch remote

Fork

Full Carbon with Anything mounts of both legs

Wheels

HUNT 650B Adventure Sport Disc Rim, Hunt E-Gravel Hub, Pillar Triple Butted Spokes

Tyres

Vittoria Mezcal 27.5" x 2.25" Front & 27.5 x 2.1" rear

Handlebar

Cairn Adventure 20 Degree Flare, 65mm Reach, 105mm Drop S - 44cm, M - 46cm, L - 48cm, XL - 50cm

Stem

Cairn Adventure 6061-T6 - S - 60mm, M - 70mm, L - 80mm, XL - 90mm

Bartape

Cairn Anti Slip Gravel

Crankset

Praxis Fazua Alloy w/42t Spider, S - 165mm, M/L - 170mm, XL - 172.5mm

Cassette

Sunrace CSMS7 11 speed 11-42T

Chain

KMC X11

Shifters

Shimano GRX ST-RX600-R & L for Single ring

Brake Calipers

Shimano GRX BR-RX400

Rear Mech

Shimano GRX RD-RX812

Rotors

Shimano SM-RT30 160mm

Saddle

Cairn E-Adventure Saddle 143mm

Seat Post

Tranz-X 80mm drop w/Dropbar compatible lever

Thru Axles

Cairn Alloy Thru Axle w/Removable Bottle Opener Handle

Other

Removeable rear mudguard bridge

Weight

15.5kg / 34lbs (w/ motor & battery, size Large)

Speed Limitations

UK/EU/ROW – All Cairn Bicycles sold in the UK/EU/ROW will be set to the maximum pedal-assisted speed limit of 15.5mph or 25kph.
US/NA – All Cairn Bicycles sold in North America will be set up per Class 1 status, allowing the bike to assist to 20mph or 32kph only when the rider is pedalling.

FAZUA DRIVE

FAZUA Drive System

See Full Details

More info on the Fazua Evation drive - https://fazua.com/en/drive-system/evation/

Three Different Riding Modes

Choose from three levels of assistance or pedal without any help, its that simple.

Gentle, constant and 100 watts* like a strong tailwind even at low rider power.

River
Progressive and very sporty mode, for a smooth riding experience! The strength of the support precisely follows your own power. Give a lot - and get a lot from the motor (max. 210 watts*)

Rocket
Aggressive assistance that helps you to tackle the steepest (max. 250 watts*)

*default settings

Black Pepper Update

See Full Details

Performance

Cadence range

Riding feel

How To Use The Drive System

700c v 650b SPECS

Spoilt for Choice - 700c or 650b?

700c

650b

We’ve broken the two bikes down to the points of difference below to help you choose which bike suits your adventure best.

Wheels

700c

HUNT 4 Season Gravel Disc X-Wide

650b

Mason x HUNT 650B Adventure Sport Disc

Tyres

700c

Vittoria Terreno Dry 38c

650b

Vittoria Mezcal 2.25" Front 2.1" Rear

Seat Post

700c

Kalloy Uno Rigid Carbon Seat Post

650b

Tranz-X Dropper Post

700c Full Specification

Frame

6061-T6 alloy with Top Tube integrated Fazua touch remote

Fork

Full Carbon with Anything mounts of both legs

Wheels

HUNT 4 Seasnon Gravel X-Wide Rim, Hunt E-Gravel Hub, Pillar Triple Butted Spokes

Tyres

Vittoria Terreno Dry 700 x 38c

Handlebar

Ritchey Butano Comp S - 42cm, M/L - 44cm, XL - 46cm

Stem

Ritchey 4-Axis 44 7 degree. S - 70mm, M - 80mm, L - 90mm, XL - 100mm

Bartape

Fabric Knurl black

Crankset

Praxis Fazua Alloy w/42t Spider, S - 165mm, M/L - 170mm, XL - 172.5mm

Cassette

Shimano CS-M7000-11 speed 11-42t

Chain

KMC e11 Sport w/EPT coating

Shifters

Shimano GRX ST-RX600-R & L for Single ring

Brake Calipers

Shimano GRX BR-RX400

Rear Mech

Shimano GRX RD-RX812

Rotors

Shimano SM-RT64 160mm

Saddle

Fabric Scoop Elite Shallow

Seat Post

Cairn Carbon Seat post 27.2mm 350mm

Thru Axles

Cairn Alloy Thru Axle w/Removable Bottle Opener Handle

Other

Removeable rear mudguard bridge

Weight

15.1kg / 33.3lbs (w/ motor & battery, size Large)

Sold out

650b Full Specification

Frame

6061-T6 alloy with Top Tube integrated Fazua touch remote

Fork

Full Carbon with Anything mounts of both legs

Wheels

HUNT 650B Adventure Sport Disc Rim, Hunt E-Gravel Hub, Pillar Triple Butted Spokes

Tyres

Vittoria Mezcal 27.5 x 2.25" Front & 27.5 x 2.1" rear

Handlebar

Cairn Adventure 20 Degree Flare, 65mm Reach, 105mm Drop S - 44cm, M - 46cm, L - 48cm, XL - 50cm

Stem

Cairn Adventure 6061-T6 - S - 60mm, M - 70mm, L - 80mm, XL - 90mm

Bartape

Cairn Anti Slip Gravel

Crankset

Praxis Fazua Alloy w/42t Spider, S - 165mm, M/L - 170mm, XL - 172.5mm

Cassette

Sunrace CSMS7 11 speed 11-42T

Chain

KMC X11

Shifters

Shimano GRX ST-RX600-R & L for Single ring

Brake Calipers

Shimano GRX BR-RX400

Rear Mech

Shimano GRX RD-RX812

Rotors

Shimano SM-RT30 160mm

Saddle

Cairn E-Adventure Saddle 143mm

Seat Post

Tranz-X 80mm drop w/Dropbar compatible lever

Thru Axles

Cairn Alloy Thru Axle w/Removable Bottle Opener Handle

Other

Removeable rear mudguard bridge

Weight

15.5kg / 34.1lbs (w/ motor & battery, size Large)

Sold out

WHEEL UPGRADES

Wheel Upgrades

You can upgrade the wheels on your Cairn or add an extra set to suit your adventures.

Sold out

FULL DETAILS

Sold out

FULL DETAILS

Sold out

If you would like to upgrade the wheels on your E-Adventure 1.0, please select "Without Tyres" in the options below as we will fit the original tyres for you.

FULL DETAILS

REVIEWS

Bike Magazine & Website Expert's View

Cycling Weekly 2020 Editor's Choice

2021 Bicycling E-Bike Award

"With its impressively steady handling manners, reasonably smooth ride, and a plethora of mounts, the Cairn is best for going places—particularly on roads and paths less traveled."

Bike Perfect 4/5 Review

"I already liked Cairn’s E-Adventure bike, but having the motor mode switch right on the top tube and having more standover space are significant gains."

Cycling News Recommends 4.5/5 Review

"Cairn has taken the already somewhat niche electric gravel bike concept, sprinkled a little adventure dust on it and come up with one of the most versatile e-bikes around."

Cyclist Magazine Review

"A well considered e-gravel bike that now offers a choice of wheel configurations."

Cyclist Magazine Review

"A well considered e-gravel bike that now offers a choice of wheel configurations."

Bike Rumour 2019 Editor's Choice Award

Bike Radar E-Adventure 1.0 Review

'As well as changes to its geometry, other key improvements include an update to the motor, changes to cable routing and controller position, and wheel options and compatibility for a dropper to cater to more adventurous riders.'

Singletrack Charged Full Review

'They produce products that they want to use, and the Cairn is a product of that: it’s a bike to replace a car, go to work the long way round, and throw in a bit of weekend adventure.'

Road. cc First Look

SIZING & GEOMETRY

Find The Perfect Size

Of course if you have any further questions please do get in touch with our friendly customer service consisting of real world riders like you.

60-DAY RIDE GUARANTEE

60-Day Ride Guarantee

We understand that buying a new e-bike is a big decision. To help you with that, we are so confident that you'll be happy with your Cairn E-bike, that we offer a full 60 days to ride it. If at any point during these 60 days you wish to return it for a full refund (or a product swap) please email explore@cairncycles.com, or call us on the phone number at the foot of our website. Unfortunately, we cannot offer a refund on any item that has suffered severe or crash damage within this period. However, we do offer a crash replacement discount scheme, so please contact us via email or phone and we will help.

Warranty

Complete Bicycle

Frame

Fork

Wheels

All Hunt Bike Wheels are provided with a 3-year warranty against material or workmanship defects. The warranty period runs from the purchase date. For more information visit help.huntbikewheels.com/support/home

Components

WAYS TO BUY

We are pleased to offer several ways to purchase your new bike. Choose between full payment, deposit only, finance or cyclescheme. Which ever suits you best.

Finance With Klarna

We're excited to announce we have partnered with Klarna to bring you new ways to pay at checkout. It's safe and simply way to get the bike you want, when you want it!

Finance available for only £137.21 per month (9.9% APR) over 24 months (12 and 36 months also available). Choose finance option when you add your bike to the basket and click Klarna at the checkout. Finance only available in UK Mainland

Cyclescheme

Cyclescheme is the UK’s leading provider of tax-free bikes for the Government’s Cycle to Work initiative.

Deposit Option - Fully Refundable

If bikes are available to pre-order, we offer you the option to put down a small fully refundable deposit, which secures you a bike for the date which is shown.

If you choose to put down a deposit, we will contact you a few days before the bike arrives so you can pay the remaining amount.

Product Availability

Please don't miss out, order now. Our bikes are in high demand due to their unique superior specifications. Please be aware that we are working hard to meet demand. Unfortunately sales often outstrip supply, so please order now to avoid

The availability status below the "Add To Cart" button gives an indication of when delivery can be expected.

LIMITED STOCK

If bikes are showing  LIMITED STOCK, we have small numbers for immediate dispatch from our UK warehouse. Please allow for 3-4 working days in order for us to fully prepare your bike for it's new adventure.

PRE-ORDER

If the bike you would like is currently unavailable, you are able to pre-order for delivery at the advertised date. See below for deposit options available.

Designed by riders, for riders. So you can ride more, experience more and adventure more.

Freedom to Travel

New For 2021

E-Adventure 1.0 650b 2021

Award Winning Design

See Full Details

Read More

Frame Improvements

See Full Details

See Full Details

Dropper Post

See Full Details

See Full Details

650b Full Specification

Speed Limitations

Read More

Three Different Riding Modes

Read More

Black Pepper Update

Read More

How To Use The Drive System

700c

Spoilt for Choice - 700c or 650b?

650B

Wheels

700c

650b

Tyres

700c

650b

Seat Post

700c

650b

700c Full Specification

650b Full Specification

Wheel Upgrades

Bike Magazine & Website Expert's View

Cycling Weekly 2020 Editor's Choice

2021 Bicycling E-Bike Award

Bike Perfect 4/5 Review

Cycling News Recommends 4.5/5 Review

Cyclist Magazine Review

Bike Rumour 2019 Editor's Choice Award

Singletrack Charged Full Review

BikeRadar E-Adventure 1.0 Review

Road.cc First Look

Find The Perfect Size

Size Chart

60-Day Ride Guarantee

60-Day Ride Guarantee

Warranty

Complete Bicycle

Frame

Fork

Wheels

Components

Ways to Buy

We are pleased to offer several ways to purchase your new bike. Choose between full payment, deposit only, finance or cyclescheme. Which ever suits you best.

Finance With Klarna

Find out More

Cyclescheme

Deposit Option - Fully Refundable

Product Availability

PURPOSE

Learn More

Freedom To Travel

Learn More

Learn More

New for 2021

E-Adventure 1.0 650b 2021

KEY SPECS

The Fastest Wheelset Is The Sum Of The Fastest Parts

Award Winning Design

See Full Details

Limitless Rims

See Full Details

PATENTED LIMITLESS TECHNOLOGY

The Details

HUNT Wheels

Read More

Ape to Gentleman - Cairn E-Adventure 1.0

Cairn E-Adventure 1.0 650b

Cairn E-Adventure 1.0 650b