MRP : ₹ 29,999

Made In : India

Made for The 27.5" MTB. Designed around the 650b format, this b'Twin Evo alloy frame delivers great performance at a good price.
Hayes MX5 disc brakes, full SRAM 24 speed groupset, double walled aero 650b wheels and adjustable Suntour XCT forks lets you glide over rough terrain and stop with ease in all weather conditions.
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Cycling comfortRaised position. Ergonomic saddle. Height-adjustable stem.Soft-touch grips.
EfficiencyCGF Evo aluminium frame. 24-speed SRAM X3. Light, 27.5" Aero Trail Evo wheels.
PrecisionDouble disc brakes. Easy-to-handle geometry. Tyres have good grip in turns.
Ease of useFork and tyres can be easily adjusted to the rider's weight.
Lifetime warrantyB’Twin provides a lifetime warranty on the frame, stem and handlebar.
Warranty2 Years
Technical Information

27.5 inches
14.7 kg in M without pedals
Frame, stem and handlebar.
Rockrider CGF Evo (Comfort Geometry Frame) 6061 aluminium frame for 27.5" wheels. Comfortable seating position thanks to raised steering. Seat is 5 times more flexible than a standard frame thanks to a narrow 27.2 mm seat post. Low bottom bracket: helps keep the mountain bike stable in turns, and makes it easier to place foot on the ground. Open steering angle (69.5°): keeps mountain bike stable while riding. Short rear wheel base: bike is easy to turn.
B'Twin U-Fit 80 fork, with 80 mm of travel and an innovative fork stiffness adjustment based on the rider's weight (55 to 105 kg). Durable thanks to the materials and fabrication processes used.ORSuntour XCT 80 fork with 80 mm of travel and adjustable fork stiffness (more/less).
No rear suspension.
SRAM S200 triple-chainring chainset (22/32/42 teeth). SRAM X3 8-speed rear derailleur. Microshift MS22 front derailleur. SRAM X4 shifters with speed indicators. SRAM PG820 cassette, 8 cogs, 11 to 32 teeth.
Tektro aluminium brake levers: lightweight and precise. Front and rear Hayes MX5 mechanical disc brake callipers: powerful, progressive braking, even in rainy and muddy conditions.
B'Twin Sport handlebar in aluminium for less weight. 660 mm. Oversize diameter for added stiffness.
Exclusive B'Twin Upside Down 0/30 aluminium stem (lower weight). Lengths: 70 mm (S), 80 mm (M and L), 90 mm (XL): shorter for more precise steering. Can be raised by up to 3 cm with 5 settings (+ 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.
Semi-integrated Aheadset offers improved watertightness, more precise steering, and an integrated look. B'Twin Sport handles with grooves, 120 mm long: genuine comfort while riding.
Exclusive B'Twin Ergofit Evo saddle offers outstanding comfort thanks to its wider "hammock" shape and good distribution of pressure points regardless of the rider's pelvis width.
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 a classic seat post. 400 mm long, offering a broad adjustment range.
Aero Trail Evo wheels with double-walled rims: lightweight, stiff, and durable. 27.5" diameter: the best balance of comfort and performance. Designed with 28 spokes to reduce weight while still guaranteeing rigidity and strength.
Exclusive B'Twin All Terrain Dry 27.5" x 2.0 tyres with a central tread specially designed for fast performance. Side lugs provide traction in the turns. Also includes a chart showing recommended pressure levels depending on the rider's weight.
B'Twin Flat platform resin pedals.
Frame : 100.0% Aluminium 6061
Store in a cool, dry place, away from corrosive products and salty air.
Frame, handlebar and stem have a lifetime warranty. 2-year warranty for parts (excl. wearing parts)
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.
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 bike with the tyre inflated and away from weathering agents like rain and Sun.


Sort by:
Poor Quality Inner Tube
Used for 2 to 8 weeks
The Bike have a flashy graphics and performs good with SRAM shifters. But except the Inner Tubes.
with 100 kms of drive i got 3 punctures with no nail piercing or any kind of damage to the tyre. Simple the tyre got bubbled up and the wheels became flat.
Indian roads beast
Used for 3 to 6 months
I've been using this bicycle for four 4 months and put it under all kinds of test. Short distance, Long distance, Climbing altitudes and even a race with the Elite group but this beast didn't disappoint me even once. It's tires good for all conditions good roads, bad roads, dry roads, wet roads. In the end great product from Decathlon.
Value for the Money
Used for 7 to 12 months
There is no doubt the product is value for the money.

Things can be improved:
1]Shifting of front gear from 2 to 3 is pretty hard
2]There is only one free service and there after per service is pretty expensive
RR520 - Excellent Bike
Used for More than 1 year
Excellent guidance by Decathlon, Mysore road staff who explained all about these new bikes and choose a right one for my use case.

I am 40+ now (used to cycle to school 25 years ago).

I am writing review after using Rock Rider 520 for more than 1 year, 13500+ km, almost 250km per week. 40 km per day for cycle to work plus few long rides in and around Bangalore. All self service so far (watch youtube), Tyre change after 10000km, . Bought helmet, rechargeable lights (handle and seat post) dual head pump, hand pump, extra tube and a toolkit plus small fittings like reflectors. Thats all required to keep going. Excellent quality bikes. Bought few wearable spare parts initially, but none need to use so far :-)

1. Excellent return on investment (Earlier used to go by car, which translates to 13000 km -> Rs.1,00,000/- (fuel cost + service))
2. Healthier than a year ago, anytime of day active.
3. No subscription to Gym.
4. Average speed 20km per hour in Bangalore city peak hours. Huge saving in time, faster by any other means in Bangalore.
5. Door to Door (no issues like last mile connectivity, dependency with other modes)
6. My bit to reduce pollution and clean environment

I wish more 40+ age in Bangalore to sign up for cycle to work.

Ashok, Bangalore
Superb.. Robust.. Awesome.. A perfect MTB!
Used for 2 to 8 weeks
This is far better than Rockrider 340. This is very Robust bike, either on highway or for offroading, you don't have to think twice before choosing the road to explore. Disk brakes works well in every situation. I personally recommend it to every bike enthusiast.
Used for More than 2 years
Worth buying
Good MTB for beginners.
Used for 3 to 6 months
I am using 520 from last 5 Month and can surely say that this is good MTP at this price. It is made of aluminum frame and having Disk break in front and rear. It is bit heavy but you have 3 front and 8 rear gears to carry that weight with an ease when pedaling.
Used for 2 to 8 weeks
Should had feature of locking the suspension. Metal colour is going where the wiring are getting rubbed against. Handle bar should have option to raise it further and can be more straight.
Rear tyre problem
Used for 1 week or less
The day I bought this cycle brought it home the tyres became flat the next morning after that I took it to the store. They changed the tube without checking anything. When I reached home taking again suffered from the same problem.I called them and told them that the same problem has occurred again. This time again they changed the tube upto this time I was very much irritated and lost interest in the bicycle. When I told them that the same thing have happened again they told me to bring the cycle we will change the tyre this tyre. But this time I returned the bicycle. Thank god I got rid of this cycle.
Response of the brand
Dear Akshay,
We understand your disappointment with the bike and we apologise for the experience that you had. We would request you to let us know, where you bought the bike from, so that we can discuss the situation with them and get back to you with a solution/explanation. 

Vikash Gupta
Front derauiler got buster and rusted
Used for 3 to 6 months
The bike is good for the price except for the front derauiler. It is worst part of the bike. Except that no much issues. Using this bike for 5 months
Response of the brand

Dear Dylan, 

Thank for taking time out to review this product. We regret the negative experience you have had thanks to the front derailleur of the bike. We advise you to please take your bike to the closest Decathlon store for the workshop technicians to have a look at the issue you are facing. If the component is found to have a structural defect explicit from usage we will replace the part at no cost. Hope this is helpful.   
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