Made for All new 27.5" MTB fully designed and exclusively produced by b'Twin. This great value 650b hardtail MTB with a lifetime warranty.
This all new Rockrider 540 model is packed with so many great features and market leading specification: 100mm hydraulic​ forks with lockout, 27 speed SHIMANO Altus gears, HAYES Radar hydraulic discs.
Sizes guide


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Cycling comfortMore fluid 100 mm hydraulic fork. Ergonomic saddle. Height-adjustable stem.
EfficiencyShimano Altus 27 speeds. Lightweight, fast rolling tyres. Fork with lockout.
PrecisionHydraulic disc brakes.Tyres made of soft rubber. Wide pedals with a strong grip.
Ease of useLockout your fork in a single step. Ergonomic built-in seat clamp.
Lifetime warrantyB’Twin provides a lifetime warranty on the frame, stem and handlebar.
Warrantylifetime warranty​ on the frame, stem and handle bars.
Technical Information

B'Twin Flat Evo VP resin pedals: both sturdy and lightweight. A large pressure surface area for more power while pedalling and better steering of your mountain bike. More aggressive pins for better contact between the foot and the pedal.
Exclusive B'Twin Upside Down 0/30 stem in aluminium for less weight. 80 mm (size M) and 90 mm (size L or XL): shorter provides more precise steering. Can be raised by up to 3 cm with 5 adjustment positions (+0 mm, + 7.5 mm, + 15 mm, + 22.5 mm and + 30 mm). Is 15% stiffer thanks to its width being increased by 48%, providing more precise steering.
Hayes Radar hydraulic disc brakes on front and rear: more powerful and progressive braking even in rain and muddy conditions, with only minimal pressure on the levers required.
Suntour XOR 100 fork with 100 mm travel. Fork stiffness can be adjusted (more/less). Fork lockout to prevent bobbing on faster terrain.
Prowheel Flint 401 triple-chainring chainset (22/32/44 teeth). Shimano Altus 9-speed rear derailleur. Microshift front derailleur. Shimano Altus M370 shifters with speed indicators. Shimano cassette with 9 cogs and 11-34 teeth.
14.1 kg in size M without pedals
B'Twin Sport handlebar in aluminium for less weight. 660 mm (size M) and 680 mm (size L or XL): wider for extra stability. Oversize diameter for added stiffness.
Rockrider CGF Evo (Comfort Geometry Frame) in 6061 aluminium. For 27.5" wheels with a comfortable position thanks to a raised steering centre. Seat is 5 times more flexible than a standard frame thanks to a narrow 27.2 mm seat post. Low crankset: Mountain bike keeps stable in turns and easy to place one's foot on the ground thanks to an open steering angle (69.5°): keeps mountain bike stable while riding. Short rear wheel base: bike is easy to turn.
Exclusive B'Twin All Terrain Dry 27.5" x 2.0 tyres. A system of lugs specially designed for all-terrain use on any type of surface. Lighter tyre sidewalls to reduce the effect of rotating mass. Includes a pressure guideline chart based on rider weight.
B'Twin Sport seat post in aluminium for less weight. 27.2 mm diameter provides the seat with a natural flex that's 5 times greater than that of a classic seat post. 400 mm long, offering a wide adjustment range.
Exclusive Sport 500 saddle offers exceptional comfort thanks to its wider "hammock" shape and wide distribution of the pressure points regardless of width of the rider's pelvis.
Semi-integrated Aheadset offers improved watertightness, more precise steering, and an integrated look. B'Twin Sport handles with grooves, 120 mm long: true riding comfort.
1) The components seen on the bicycle in the videos may change from the actual product. 2) The bicycle will be delivered in 95% assembled condition(Handlebar and pedals have to be assembled). The directions for the cycle assembly will be sent via mail ( if you have subscribed) and available on the product pages. The tools for assembly are provided with the cycle only for online buyers.
1) If you will need a spare part to be replaced, we have it all at our workshop. You will have to drop by our workshop to get your cycle serviced. 2)The 3-month, free checkup is valid only if the user is able to take the bicycle to a decathlon workshop. 3) All bicycle accessories need to be purchased separately.
Information / Concept / Technology
Stockage tips
Please store the cycle in a cool and dry place away weathering agents like the sun and rain. Always keep the tyres inflated.



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All rounder bicycle
Used for 2 to 8 weeks
Have been using this bike model for many weeks now. This is truly an all-rounder. I'd gone to buy a Rockrider 520 but ended up buying the Rockrider 540 and I do not for a moment regret my choice. The biggest reason I went for the 540 is because of the hydraulic front shock ups. Compared to the non-hydraulic (spring) ones on the 520, the difference is obvious. City rides over broken and potholed roads are much much smoother now. The presence of hydraulic brakes on this bike helps - however I don't notice that much difference from cable-disc-brakes or v-brakes. The bike feels well made with premium materials. The Shimano Altus gear system (9x3 = 27 gear ratios) is smoother than the Shimano Tourney system that is found on lower range bikes. Having more gear ratios helps too - makes the bike versatile for all conditions.

For buyers thinking of putting a pannier rack on this bike - you should buy the rack from Decathlon itself and get it fitted at the store - right when you buy the bike. This is because this bike is designed to take a pannier rack even though it has a rear disc brake.

All-in-all a great product.
Review after using 17months & 8,000Kms
Used for More than 1 year
This review is.going to be precise and to the point.
1) Riding comfort is pretty good. I have done 193Kms in a single day without any discomfort
2) Bike's posture is bit aggressive riding gesture
3) Impressive handling, cornering, balance and stsbstabi
4) Braking performance is quite powerful and balanced
5) Weight is standard
6) Pretty much fast in off+on road
7) Suspension is very much supportive during rides, especially in deep/ big holes in path
8) Shifting is satisfactory, especially the rear one (only if you maintain it properly)
9) Crank is Shimano chainring compatible for replacement
10) Price of the bike is very attractive

1) The colour on the frame is quite fragile. S small scratch may prevail the aluminium frame. This is not satisfactory at all.
2) The from derailure (micro shift derailure) is not performing satisfactorily. The chain shifting leaves scars/ marks/ scratches on the frame (just below the crankset)
3) Hayes Radar is pretty much costly Braking System. Spares/ parts/ servicing is rare in the market. Above all, price is also high
4) The Bottom Bracket has a peculiar size and this size is also unavailable in market (VP BC73, 68X115)

1) I had replaced the rear tyre within 6 months because of the wrong assembling of Decathlon's bike assembler. The rotation of the tyre was wrongly installed and i didn't checked.
It is the best cycle , you buy
Used for 7 to 12 months
Buy it
front derailleur touching chain again.
Used for 3 to 6 months
ibought 3 months ago since that time i have been facing the issue usually i ride sometimes. before the gear shifting issue in front crank when ever i change the gear in front it was not working properly. then i took it to workshop till now the issue is solved, but still the front derailleur is touching the chain. i told to change because its from manufacture defect but they are charging for it feel sad.
Response of the brand

Thank you for taking the time to give us your review. Apologies for the bad experience. Please let us know from which store you have purchased the bike from and we will get in touch with you regarding the problem. We do a 14 point check before selling the bike in which the front derailleur issue would have been noticed. 

I remain available at your disposal.  

kpg not found this answer helpful
Mind blowing bicycle
Used for 2 to 8 weeks
It's a excellent MTB with a very competitive price. Suspension is superb and brakes are too good .....Gear shifts very smoothly I really love this bike.
Pathetic cycle
Used for 3 to 6 months
I bought this cycle 2 months ago ... Chain got rusted and the seat is not setting up on one place and coming down I think the seat lock is also damaged.. pathetic product...
Response of the brand
Hi Farhaan, 

Thanks for your feedback. We regret the negative experiences you have had with your bicycle. Bicycle chains are prone to rust if stored or used in a moist or wet climate. Steel components of chains can withstand corrosion if applied with lubricants on a regular basis. In regard to seat clamp  

A grt product and well tested worldwide.Enjoying
Used for 2 to 8 weeks
Replaced it with my old cycle and can definitely feel the difference .. want some accessories but feel it little costly so still waiting
Really rocking
Used for 2 to 8 weeks
Hi I’m using this bicycle for last 7/8 week and really it is superb in riding with city road and off-road ,great controls and smooth shifting gear. Graphics of this bicycle is really attractive.
B-twin bst buddy to have in life
Used for 1 week or less
Was my wish list to buy one ,today I own a b-twin 540 and I am happy the best cycle I have rode till present excellent design and shifting gears .I can proudly say a good investment
Best store ever
It is best sports shop ever
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