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.
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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 85% assembled condition. The directions for the cycle assembly will be sent via mail ( if you have subscribed). The tools for assembly are provided with the cycle only for online buyers. 3) The 3-month, free check up is valid only if the user is able to take the bicycle to a decathlon workshop.4) All bicycle accessories need to be purchased separately.
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.
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.


Selling price
₹ 799
Selling price
₹ 499


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Not that grate
Used for 1 week or less
Cycle spokes, Front and rear gear changers / derailleur, shock absorbers, disc brakes and all the nut bolts are of steel which adds weight to the cycle.
I have used it for 3 times and I can observe cracks on the sidewall of the tires which is annoying.
The best budget MTB in the Market
Used for 7 to 12 months
I've been riding it for 7½ months now and I've put it through a lot of punishment. I've rode it hard and on every surface possible. The fork holds up to a lot of punishment and the gears are very smooth. The front derailleur is buttery smooth and the rear Altus derailleur is very good. The brakes are quite strong but they need to be bled every 6 months if used a lot like I do.
Purchased November 2016
Used for More than 1 year
Good components go on this bike. Used for almost one year now. Decent shifters and with proper maintenance, this bike can go a long way. Good frame sizing, although Btwin RR series are a bit aggressive when it comes to ride position. That is my view and not a bad remark. There is one major flaw with Btwin though, and that is tires. Pathetic quality. Reduced one star just for that. Huge cracks develop on the side walls and tread; within a month of purchase in my case. Learnt later that this is the case with most Btwin tires for MTBs. I was told that Btwin all-weather and dry-weather tires are meant only for trails and not tarmac or asphalt. Better to get better tires that hold better life.
Used for 1 week or less
This cycle is very good in a fine price
Best MTB in budget
Used for 3 to 6 months
I have been riding this bike for almost 2000 kms, including 800kms Spiti valley expedition and one who knows Spiti valley or Himalayas, will know about the roads there.
But even in those toughest roads, I had no trouble with the bike at all even after having 20kgs of load as the expedition was self-supported.
Brakes, shifters, derailleurs, are working perfectly, only need to change the tyres.
A good bike with rotting tyres
Used for 3 to 6 months
It's a good bike with better components than other similar priced bikes and I enjoy riding it.

Good shifters, good fork. The brakes could be better, some mechanical brakes feel better to use than the hydraulic ones on this (it might be needing some servicing). Also recently the rear disc started making loud and annoying squealing and clicking sounds when I brake.

The tyres, I did not bother to check them at the stores and a couple of days later, noticed little cracks all over the tyres(dry rotting I assume). The front had cracks all over the top while the rear had cracks all over the side walls. Certainly not replacing them with B-twin tyres.
Worst tires
The first time when I replaced my bike's tire due to crack found all over it .At that instance I thought it must be defected product.but soon after that replacement I faced same problem again but this time they denied replacement saying that they are wearable parts but in my opinion cracks won't happen because of that reason. so it is better to go for other tire brands.
Response of the brand
Hello Ron, 

Thank you for taking the time to give us your feedback. Tires are a very difficult component to assess because they are subjected to wear and tear. The life of the tires also depends on the storage and usage (tire pressure) etc. But cracks on the tires is a feedback that I will pass on to the product manager. If it is ok for you, we will need to get in touch with you for more details. Apologies for the bad experience you have had to experience with the tires. 

Parikshit found this answer helpful
best cycles in decathlon .and good servicing
Used for 2 to 8 weeks
very comfort and stylish good for mountain bikers good quality and low weight
My updated ownership review
Used for 3 to 6 months
>Front wheel loosening was just due to the new and shiny parts in the initial weeks. Never faced it after regular usage.
>As promised by the shop head, Fork oil leakage is reducing with usage
>There is only one complaint or rather a suggestion: I expect the rear spoke tension to remain stiff and not get loose upon "slightly moderate to moderate" offroading.
Apart from this I'm quite satisfied with the bike
Very Sturdy. Very Light Bike
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Used for 2 to 8 weeks
Shimano Altus derailleur had to be fine tuned.

One problem, if I can say, the front suspension lock adjuster knob is coming off.
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