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MTB with air suspension and hydraulic brakes.

All Bikes - Rockrider 520 S Full Suspension Mountain bike  B'TWIN
Reference : 8208678
All Bikes

B'TWIN Rockrider 520 S Full Suspension Mountain bike

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intensive mountain biking. Optimised brakes & weight: Take on the steep slopes.

To view our full range visit our mountain bikes category.


Please select a size

Please select a size


until £450.00 -17 %

From £375.00**

DecathlonDeeeTaxMentionAfterPrice /

Price in store £450.00 £375.00 **

Reserve in store

From 24/04/2015 To

** From 24/04/2015 To

* Sales from to Until end of stock
** Sales from 24/04/2015 to Until end of stock

From and limited stock

* Sales price at

From and limited stock

* Sales price at

* From 24/04/2015 and limited stock
** From 24/04/2015 and limited stock

Home Delivery
free on orders over £70* - More information

Freedom of Return
find out more about our returns policy.

Safe payment
PayPal, Verified by VISA & MasterCard SecureCode.

Important: When you purchase a bike online, pedals are not fitted and the stem/bars are not adjusted. Please visit this video to see how to correctly set up your bike.

Life Time Warranty: B'TWIN makes the life time warranty for the frames, brackets, stems and rigid forks. Guaranteeing your Bike for life!

Product benefits

    • User comfort
    • 120 mm rear air shocks: softer, smoother & lighter. Ultra comfortable saddle
    • Efficiency
    • Double, hydraulic disc brakes. Forks with lockout feature. 27-speed SRAM .
    • Ease of use
    • Lockout your forks in and instant. Pressure adjustable shock absorbers
    • Lifetime warranty
    • B’TWIN guarantees the frame, stem, and handlebars for life.
    • Accuracy / precision
    • Quick gear change. Easy, precise breaking. Hybrid tyres
  1. Guarantee : Frame, handlebars and stem have a lifetime warranty. 2-year warranty for parts (excl. wearing parts)

Product information

M(1.65-1.75), L(1.75-1.85), XL(1.85-1.95)
black / white / red
Wheel size
26 inches
fork and shocks
14.7 kg in M without pedals

your reviews

4.8 / 5

13 reviews

12 people recommend this product

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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

Brilliant all rounder

Very well designed, great ergonomics + aesthetics



  (United Kingdom)

20-29 years old    Man

5 5

used for 3 to 6 months Brilliant bike, nice and lightweight but very strong structurally. Great suspension, hydraulic front forks and air rear. Nice crisp gear changes and the hydraulic brakes are precise and never give trouble (so far anyway). Good thick high grip tyres coupled with a very well designed frame and smooth ride make it very agile on tight mountain tracks, in fact it outperforms my friends £800 hardtail mtb.
Personally I feel this bike is very well designed both ergonomically and the aesthetics are very nice also.
Kudos to the designers, well done!

Excellent bike!

Steady ride, confortable and robust.

Lack of instructions/documentation when delivered.


  (United Kingdom)

30-39 years old    Man

5 5

used for 2 to 8 weeks I am using this bike for ~1 month now (70km various terrain). No problems so far (i have calibrated/double-checked all shop settings for brakes, shifting mechanisms, dampers, etc.). Tested it on high-speed lanes, mud, off-road tracks, steep climbs and descents - always surprises with good handling and soft ride. Well balanced for riding at high speeds ~ 50km/h, but the gear-shifting system will hardly allow you to go higher anyway. If you have never used Hydraulic brakes, than the RR6.5 braking performance may surprise you, delivering crisp and precise breaking: easy to use and lite on action.
As every MTB bike has (in my opinion) a poorly though mudguard attachment system

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= 2.7 kg in size M, without shocks.

  • 2

    Fork Hydraulic Rockrider fork with 120 mm 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 640 mm 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

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

  • 11

    Wheels Rockrider Sport wheels, with 32-eyelet, 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 your 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

Stock advice

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

Care instructions:

We recommend reading and following the maintenance instructions found in the manual that comes with your Rockrider bike. The maintenance instructions and component settings are available on The safety inspection (3 months after purchase) at your local store's workshop is FREE and RECOMMENDED.

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