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Air shocks, hydraulic brakes.

All Bikes - Rockrider 520 S Full Suspension Mountain bike  B'TWIN
All Bikes

B'TWIN Rockrider 520 S Full Suspension Mountain bike

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athletic MTB riders touring off-road in the country or mountains. Optimised brakes & weight: Take on the steep slopes.

To view our full range visit our mountain bikes category.

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Reference : 8208678

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4.6 / 5

15 reviews

13 people recommend this product

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suspension ,braking

No stand


  (United Kingdom)

Under 20 years old    Man

5 5

used for 1 week or less Hello this ragul...frm we donot find cycle racks i feel that if stands would have been there for rockrider 520s it will be better..any way my dream has come love this cycle to this core..awesome..the cycle i ever dreamt ..

Poor customer experience


  (United Kingdom)

+60 years old    Man

1 5

used for 2 to 8 weeks After ordering on line on 17/04/15 for delivery to the Croydon store, it took 8 days to arrive. When I went to collect it 2 days later the bike was still in its box. No one had checked it over to make sure the gears were operating correctly and I find they are slipping. The bike comes with a single sheet of A4 to describe how to fit the pedals and straighten the handlebars but not a manual for adjustment and servicing. I believe this is very poor. Also I now find the bike is £40 cheaper and I feel ripped-off.

Response of the brand

Dear sir,
I'm sorry to read that the bike was not set up correctly by our team.  The bike should be fully checked before being boxed/dispatched from the warehouse in the same manner as if it were sent to your home.
You are correct that we don't provide manuals for adjusting and servicing: Here is a basic booklet which will give you a lot of advice:
This bike is now on sale and since you purchased it , it has now become an end of line item, this is why the price has dropped.
I will ask our customer service team to contact you directly to listen to your concerns and make sure that we can resolve them. 
Once again, please accept my apology for the issues encountered.
Peter Lazarus UK Cycling Market Manager DECATHLON

Great bike for the money

Comfortable, great handling good features. love it

Clunky fork when locked, still great at this price


  (United Kingdom)

30-39 years old    Man

5 5

used for 7 to 12 months Overall a great bike that handles beautifully, comfortable and fun to ride. Any slight glitches are easily forgiven at the price. Excellent value for money.

Great Ride


gears can be a tad tricky


  (United Kingdom)

30-39 years old    Man

5 5

used for 2 to 8 weeks I bought this bike, as i didn't want to spend£1000's on a new "brand" name bike. I wasn't disapointed. The huge forks at 120mm make even the steepest drops doable, and the adujustable rear shock is the same. Lock out forks make riding it up hill a doddle. The narrow handlebars make it easy to manover through small gaps, My only gripe is the poor foot clips. They get in the way, either replace them or take em off.

All my friends now want to ride my bike when we go on trails whilst doing jumps, out riding their treks and giants!!

Very good

Well pleased with bike



  (United Kingdom)

50-59 years old    Man

5 5

used for 3 to 6 months I love riding it

Technical Information

  • 1

    Frame New 6061 aluminium oversize S.I.X frame with 120 mm rear wheel travel, based on a monopivot suspension system offering high sensitivity to small shocks but also gives the bike sturdy resistance to strong impacts. Weight= 2.7kg in size M, without shocks.

  • 2

    Fork Hydraulic Rockrider fork with 120mm of travel, with magnesium blade for lighter weight, with lockout at the top of the right damper for rolling terrain, and with easy adjustment of the pre-load (fork hardness) at the top of the left damper. A fork which has already proved itself.

  • 3

    Suspension X-Fusion E1 air shocks, lightweight, specifically adapted to the S.I.X. frame, easily adjustable to the rider's weight thanks to the schrader valve: a great balance between sensitivity and performance

  • 4

    Drive train Shimano Tourney front derailleur, Sram X5 rear shifter and derailleur: very good combination in terms of comfort of use, speed of gear changes, and reliability. Thanks to its 27 speeds and its quick gear changes, it is easy to find the right gear for each new type of terrain.
    Bottom bracket Suntour XCT triple chain wheels, 22/32/42 teeth. 9 speed Sram ESP 5.0 cassette, 11 x 34. Sram chain with quick-release.

  • 5

    Brakes Tektro Auriga Comp hydraulic disc brakes, offering high braking power while remaining progressive and easy to dose. 160 mm front and rear discs. Front and rear "postmount" callipers, directly screwed into the frame and the fork: gain in weight and ease of adjustment! Discover the power of hydraulic disc braking, you will not be disappointed!

  • 6

    Handlebar Oversize 640mm diameter Rockrider Sport aluminium handlebar, for better rigidity and stability on descents.

  • 7

    Stem Rockrider forged aluminium oversize diameter stem for more rigidity, with a 6º "backsweep" angle. The components are marked to help you find the best setting.

  • 8

    Steering Semi-integrated headset for improved watertightness, precision while riding, and a built-in look. 120 mm Rockrider mono-density grips.

  • 9

    Saddle Rockrider by Velo bi-material saddle with a sporty look. Comfortable, narrow saddle to avoid thigh chafing.

  • 10

    Seatpost Rockrider 29.8 mm diameter seat post, length: 350mm. Quick, tool-free saddle tightening.

  • 11

    Wheels Rockrider Sport wheels, with 32 hole double-walled aluminium rims: guaranteed shock and warp resistance, and lightweight! Aluminium hub compatible with disc brakes only.

  • 12

    Tyres Front and rear KENDA Nevegal 26x2.10 rigid bead tyre, known for its versatility: it behaves well on all types of surface, whatever the weather (dry or wet), thanks to its deep and well distributed tread, and its "Stick-E" rubber which provides good grip. Tyres with inner tube.

  • 13

    Pedals Wellgo platform pedals, with strapless toe-clips, for good foot support and the ability to remove your foot quickly should you lose balance.

  • 14

    Accessories Transparent self-sticking base protection: your frame paint need not fear!

  • 15

    Weight 14.8 kg in M without pedals

  • 16

    Electrical assistance No electric assistance.

Information / Concept / Technology

S.I.X. suspension system: Monopivot frame for greater simplicity and sensitivity, based on 120 mm travel.

Restricted use :

not designed for: BMX, Dirt, Freeride and Descent.

Stock advice

Store in a cool, dry place, away from corrosive products and salty air.

Care instructions:

We recommended reading and following the maintenance instructions provided with your Rockrider bike. The maintenance instructions and component settings are available on The safety visit (3 months after purchase) at your local store's workshop is FREE and RECOMMENDED.