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) 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 bike with the tyre inflated and away from weathering agents like rain and Sun.


Selling price
₹ 199
Selling price
₹ 299
Selling price
₹ 6,999


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Excellent bike..!
Used for 2 to 8 weeks
This bike is excellent. It is comfortable too and riding position is impressive.Rear gear shifting is smooth but there is a problem in shifting the front gears. This would be probably due to change in the setting.Though it is not a big issue. It has a good price tag of 26k.I recommend buying insurance with the cycle. It costs about 1300 which is not that high. It is fun to drive bicycle.
Its good, still not great
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Used for 3 to 6 months
I had RR 340 before and upgraded to RR 520 thinking it will be great than that, but as far as my experience is concerned I would say, the best things here is the gear shifting its just flawless, comfort is good. But when it comes to breaking in wet or semi wet or even some times in dry terrains it performs very bad compared to RR 340. The RR 340 though had V breaks its breaking was just more helpful than this RR 520. I cant say anything very special about this RR 520 compared to my previous bike RR 340, FROM price point and so many other things.
Can't stop riding...!
Used for 3 to 6 months
I have been using this bike for last 6 months which I bought from Decathlon Calicut branch. Since the first day of my ride I'm being more and more addicted to ride my bike. I bought almost all the accessories and other riding gears.

1. Style that everyone likes. Not being a round shaped frame. Matt finishing is excellent.
2. Comfort which let you ride long distance with ease.
3. Gear is so smooth like one in pro Cycle, which I felt.
4. Brakes are so powerful (During rain little friction less but does the job)
5. And many more.

1. Seat is bit rough so, it'll start paining after many kms. (Using a good cushioned seat cover or riding shorts rectify it)
2. Not much
Btwin rockrider 520 rocks
Used for 2 to 8 weeks
Best cycle and best price best quality good gear and disc brakes are very powerful bought it in rat mall Bangalore on 20 august 2017 loved it
Excellent Comfortable BiCycle
Used for 3 to 6 months
* Excellent Bicycle, well designed and good build quality
* Very comfortable and smooth to ride
* Gear change is smooth
* Breaking is excellent
* Overall a best buy at 26k price.
* I am using it daily for office commute since 3 months.
* I recommend this bicycle.
Btwin rr520 rocks nothing is better than that
Used for 2 to 8 weeks
I would have driven 100 km + it has been 2 to 3 weeks since I got it. Only the seat is a bit uncomfortable. Worth of money. Disc brakes are really very good.
Awesome Bike
Used for 3 to 6 months
This is a very well designed , great performance Bike.
Everything is very nicely and thoughtfully designed . This bike performs beautifully on hill ride and on planes . It has all the gears ratio to match any kind of terrain. A Great performer and full value for money
B'twin RR520 Rocks....!!!
Used for 3 to 6 months
Bought this bike at the middle of September 2016, done about 200+ kilometres so far both off road and on road but primarily on road. On road its very good for urban movement with easy shifting, braking and very manouverable . Front sifter is slightly stiff when going 1st to 2nd however this could just be my fault or this particular bike. Bike colour BLUE is very nice and is clearly visible when in urban or rural areas. When off road the bike performs admirably with good braking and traction in both dry and wet conditions. All round it is a Outstanding Sports MTB bike...
rockrider 520
Used for 7 to 12 months
There is problem with tube valve ,air bubbles is coming when keep water
it is good and comfort for riding,i like it
back weel air presseure is gradually decreasing
Best deal
Used for 3 to 6 months
It is the most comfottable cycle of this budget
Gear shift
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