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The no 1 sports MTB: aluminium frame & disc brakes

All Bikes Cycling - Rockrider 500 Mountain Bike B'TWIN - Bikes
Reference : 8293150
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B'TWIN Rockrider 500 Mountain Bike

The b'Twin Rockrider 500 Mountain Bike is perfect if you're looking to get into hitting the trails. With a lifetime warranty aluminium frame, front and rear disk brakes and a SRAM 24 speed drivetrain you can be confident that this bike is built to last.

To view our full range visit our mountain bikes category.



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until £239.99 - %

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Price in store £0.00 £239.99 **

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Product benefits

    • Lifetime warranty
    • B’TWIN guarantees the frame, stem and handlebar for life.
    • Low weight / lightweight
    • 6061 aluminium sport frame, double-walled alu rims. 14.07kg in XS without pedals
    • Cushioning
    • 80mm adjustable suspension fork for shock absorption.
    • Accuracy / precision
    • SRAM 24-speed drive train, dual cable disc brakes.
    • Anatomic design
    • 5 sizes available to perfectly fit the user.
    • Compatibility
    • Accessories compatible with frame: pannier rack, bottle cage, mudguard etc.
  1. Guarantee : Lifetime warranty for frame, stem and handlebar on this bike. Details on

Product information

XS:135-150; S:150-165; M:165-175; L:175-180; XL:180-195
Wheel size
26 inches
Suspension fork
14.07 kg (XS) without pedals

your reviews

4.6 / 5

13 reviews

12 people recommend this product

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Rockrider 500

Great bike for the money

None as yet


  (United Kingdom)

50-59 years old    Man

5 5

used for 1 week or less Originally intended to buy a Carrera Subway but discovered the Rockrider 500 and went for it.
First day out was getting used to cycling again after twenty or so years, then second ride was out for five hours.
A few tweaks here and there and I had everything in my ideal riding position.
This is an amazing bike to ride, smooth gear changes without any grinding or clunking and the powerful disc brakes give you so much stopping power and confidence, though they squeak when its wet, don't know if all disc brakes do this?
I like the plastic toe clips which keep your feet in the correct position on the pedals.
The staff at Decathlon in Wednesbury were really helpful and patient with me and helped me buy the bike I wanted, not sell me another.
I will (and already have) recommend Decathlon and the Rockhopper 500.
Thank you Decathlon and keep up the good work.


It was only £165 from Decathlon, amazing value.



  (United Kingdom)

50-59 years old    Man

5 5

used for 1 week or less This is the best bike I've owned in a long time. I'm nearly 50 now and I just needed something to M.O.T. myself (lol), and this bike is good for that. I've also been admired a lot more by the ladies in my area while riding it around so I guess this bike is a bit of a cycling babe magnet too.
My wife will definitely need to buy one too or she's in danger of losing me to a cute lady rider, once I loose my gut of course:-).

Rock rider 500

Great mountain bike for the money

Puncture in rear tyre


  (United Kingdom)

50-59 years old    Man

5 5

used for 2 to 8 weeks Tyre was flat in the shop inflated by shop assistant but inner tube had to be replaced at home because of puncture

happy with the bike apart from

the whole bike is nice

stronger wheels


  (United Kingdom)

20-29 years old    Man

5 5

used for 2 to 8 weeks I am happy with the bike and I would advise anyone to but it apart from i have hit a log takeing it on a track and buckled the front wheel on the bike apart from that you get your moneys worth

Absolutely great bike,

great frame, wheels and service from decathlon

gear shifters (but not used to them yet)


  (United Kingdom)

20-29 years old    Man

5 5

used for 1 week or less Absolutely a great bike for the price. This was a replacement bike as my former one was stolen from outside my home. The service was absolutely great was told 20 minutes so had enough time to get the few accessories I needed for this bike. I've ridden it and it rides well, coping with fast gear changes, slow and fast corners and able to cope with slow controlled riding to avoid people. The gear changes are great they feel chunky and you can feel them work. The tyres are very grippy.
My only problem are the gear shifters as the up shifter is really far back on the brake/gear fitting. but overall great bike.
Hopefully its the same as you guys too

Technical Information

  • 1

    Frame Exclusive 6061 reinforced aluminium frame.
    Sports geometry, perfect for athletic touring.

  • 2

    Fork Stiff and durable Rockrider by Suntour XCT 80mm fork.
    Knob for manual hardness (preload) adjustment.
    Elastomer spring technology for more reliability and a longer lifespan with minimum maintenance.

  • 3

    Suspension No rear suspension.

  • 4

    Drive train SRAM 22x32x42 triple chain ring crankset
    SRAM X4 rear derailleur
    MICROSHIFT M30 front derailleur
    SRAM shifters with indicators for the 24 gears
    SRAM 11x32 cassette.

  • 5

    Brakes SRAM SB400 CBS levers.
    ALONGHA front and rear cable disc brake callipers: better braking even in rainy and muddy conditions.

  • 6

    Handlebar Rockrider SPORT handlebar, 600mm wide (XS and S) or 640mm wide (M, L and XL).

  • 7

    Stem Rockrider SPORT stem, diameter 25.4mm. Length: 90mm (XS and S) or 110mm (M, L and XL).

  • 8

    Steering Aheadset Rockrider SPORT headset, 1⅛".

  • 9

    Saddle Ergonomic B'TWIN SPORT Viper saddle in polyurethane.

  • 10

    Seatpost Rockrider SPORT 29.8 mm diameter seat post.

  • 11

    Wheels B'TWIN SPORT rims with 32 rings,
    B'TWIN SPORT hubs,
    Stainless steel spokes, 2 mm diameter.

  • 12

    Tyres 26 x 2.00 VTT SPORT tyres for versatility and excellent lateral traction.

Information / Concept / Technology

Restricted use :

Not designed for BMX, dirt, downhill or racing.

Stock advice

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

Care instructions:

Grease your chain regularly and check your tyre pressure often (recommended before each outing). Check your housing every three months and ensure screws and nuts are well tightened.

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