Rockrider 520 Mountain Bike

    Designed for MTB touring.

    More details
    SKU: S120236 (1864812)
    Select a color:
      Select a size :
    Size Guide

    Delivery in 6 to 7 days

    € 298.80
    Our e-commerce is suspended for a transition period. We expect to be back soon!
    Characteristics Designed for MTB touring.
    Product Benefits
    1. Cycling comfort
      Raised position. Ergonomic saddle. Height-adjustable stem.Soft-touch grips.
    2. Efficiency
      CGF Evo aluminium frame. 24-speed SRAM X3. Light 27.5" Aero Trail Evo wheels.
    3. Precision
      Double disc brakes. Easy-to-handle geometry. Tyres have good grip in turns.
    4. Ease of use
      Ease of use
      Fork and tyres can be easily adjusted to the rider's weight.
    5. Lifetime warranty
      Lifetime warranty
      B’Twin provides a lifetime warranty on the frame, stem and handlebar.
    • Size
      M / L
      27.5 inches
    • Weight
      15.2 kg in M without pedals
    • Life warranty
      frame, handlebar, stem.
      80 mm suspension fork
      Grey / Yellow / Blue
    Product feature
    1. Frame
      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.
    2. Fork
      Suntour XCT 80 fork with 80 mm travel and adjustable fork stiffness (+ / -).
    3. Suspension
      No rear suspension.
    4. Drivetrain
      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.
    5. Brakes
      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.
    6. Handlebar
      B'Twin Sport handlebar made from aluminium for reduced weight. Available in 660 mm (size M) and 680 mm (size L): wider for extra stability. Oversize diameter for more stiffness.
    7. Stem
      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.
    8. Steering
      Semi-integrated Aheadset offers improved watertightness, more precise steering, and an integrated look. B'Twin Sport 120 mm grips with grooves: genuine comfort while riding.
    9. Saddle
      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.
    10. Seat post
      B'Twin Sport seat post made from aluminium to reduce 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 wide adjustment range.
    11. Wheels
      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.
    12. Tyres
      Exclusive B'Twin All Terrain Dry 27.5" x 2.0 tyres with a central tread optimised for good performance. Side lugs ensure good traction in turns. Comes with a table of recommended pressure settings depending on the user's weight.
    13. Pedals
      B'Twin Flat resin pedals.
    14. Accessories
      Mountain bike sold with a water bottle, bottle cage, hand pump, saddle bag, an extra inner tube and 3 tyre levers. This mountain bike can also be fitted with a pannier rack, mudguard, stand, etc.
    15. Weight
      15.2 kg in size M without pedals, including accessories.
    16. Electric assistance
      No electric assistance.
    Product testing
    1. Composition
      Frame : 100.0% Aluminium 6061
    2. Approved by
      The Mission Test test users in the Lyon mountains, in May 2015.
    3. Storage advice
      Store in a cool, dry place, away from corrosive products and salty air.
    4. Product restrictions
      Not suitable for All Mountain, Enduro, BMX
    5. Product catchline
      The Rockrider 520 equipped with 6 accessories essential to mountain biking; what you need to stay hydrated and perform minor repairs.
    6. Lab tested
      We recommend that beginners wear cycling shorts with a protective pad and/or a gel saddle cover to reduce soreness.
    Product reviews
    4.2 / 5
    101 reviews
    101 users recommend this product
    Write a review

      Claire (United Kingdom)
      Used for 7 to 12 months
      I bought this bike for my sons birthday march 2017 and had nothing but problems with changing the gears and chain coming off so much so now after a short time of using the bike its now unusable whilst out riding one day his chain came off after changing gear it got caught and now the chain is bent amd the deraliur has completely snapped after 7 short months of using it for the price its not worth buying
      Response of the brand
      Please feel free to return this bike to one of our store workshops as a few simple adjustments may well resolve all of the issues. Gearing cables can stretch and require adjustment within the first few weeks. I'm sorry to read that you've had issues with the bike, I can appreciate that poor gearing can make it an unpleasant ride.
      Peter, National Cycling Manager, DECATHLON
    • B'TWIN Rockrider 520

      bman (United Kingdom)
      Used for 3 to 6 months
      I bought this bike on the reviews . As with other reveiws the chain did come. Thought this might be a simple fix but ended up £75 for a local bike shop to fix. Decathlon did offer a fix but as I was to far the nearest decathlon shop it would have taken at least two weeks for the fix and return. >unfortunatly that was way to long as bike needed every day. Other than that it is an excellent bike for the money.
    • My point of view

      Mark (United Kingdom)
      Used for 1 week or less
      Beautiful bike amazing price quick delivery but a little up set got my bike nice and good roded it for a little bit after Mabey 15 mins of riding the chain broke and the bike seemed a little of and on
    • Great bike....great value

      Graham (United Kingdom)
      Used for 2 to 8 weeks
      Really pleased with's good looking and performs well.
      For the money you will not find better!
      To make things even better the buying process was simple and the staff at the store were great
    • Great bike

      fraser (United Kingdom)
      Used for 2 to 8 weeks
      Unbelievable bike for the price, had no issues on any terrain. Even friends with bikes from the much higher price range, have had nothing but great things to say. Unfortunately I had to settle for an xxl as it was all that was in stock, it's slightly too big and that is my only negative, but that's a personal issue, not a comment on the bike itself.
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