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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. The no 1 sports MTB: aluminium frame & disc brakes


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until £239.00 - %

From £239.00**

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Price in store £0.00 £239.99 **

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** Sales from to Until end of stock

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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

  1. 1
    Lifetime warrantyB’TWIN guarantees the frame, stem and handlebar for life.
  2. 2
    Low weight / lightweight6061 aluminium sport frame, double-walled alu rims. 14.07kg in XS without pedals
  3. 3
    Cushioning80mm adjustable suspension fork for shock absorption.
  4. 4
    Accuracy / precisionSRAM 24-speed drive train, dual cable disc brakes.
  5. 5
    Anatomic design5 sizes available to perfectly fit the user.
  6. 6
    CompatibilityAccessories compatible with frame: pannier rack, bottle cage, mudguard etc.

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 / 5

5 reviews

4 people recommend this product

Write a review
Sort by :

best HardTail MTB for the money

disc brakes

a little heavy, but hey its under £250


  (United Kingdom)

40-49 years old    Man

5 5

used for 3 to 6 months I did a lot of research for a economical bike - this was by far the best. Great bike guys in store and excellent aftersales offering a free service after a few weeks.

Response of the brand

Thank you for taking the time and effort to write this review - customers find them really useful when making purchasing decisions. We are also very pleased to hear that you like your Rockrider 500 and have had good after-sales experience when it needed a fix! We only wish it to accompany you on many rides in the future! Happy cycling :)

Ugne Pakalniskyte Customer Service Advisor DECATHLON


Great service from assistant - really helpful

No free service after 3 months


  (United Kingdom)

+60 years old    Man

4 5

used for 2 to 8 weeks Pleased with bike but wires obviously stretched on first outing. Would have been nice to have had a free service included after a short period to correct initial teething probs. Most other shops offer this.
Also would have been good to have been given a paper on how to maintain bike - even if it meant a download from website. I'm not sure how to deal with probs with hydraulic brakes!!
Overall I'm pretty pleased with my deal but think that for very little extra effort you could have gone that extra yard to please (by dealing with above points) which would have meant me giving you a 5 star rating.

Response of the brand

Dear Sir,
Thank you very much for posting a review of your b'Twin Rockrider 500 Mountain Bike.
We offer a free 14 point checkup anytime within the first three months after purchase.  Please don't hesitate to contact your local decathlon store workshop to book your bike in at a time which is convenient for you.  We check the drivetrain, brakes, wheels, headset, tyres.
We also have a bike maintenance page which can help if you want to learn how to maintain your bike:
There is a maintenance manual available, here it is for download:
If you have any other questions, please do not hesitate to get back in touch.
Peter Lazarus UK Market Manager DECATHLON

Kevin found this review helpful

Bad bike and Worse service!

Looks good

Falls apart!


  (United Kingdom)


2 5

Lots of problems with the gears!
Saddle came lose on the first day of use.
Third time I was out on it the pedal came off(luckily I was going slowly, otherwise it would have been DANGEROUS)
£40 in a taxi to take the bike back. Bike got scratched in the boot
Mechanic in the shop didn't appear to care. Told me that the bike was for amateurs and to stay away from dirt tracks.
All in all a poor service. I work hard for my money and invest it wisely, Really disappointed.

Response of the brand

Dear sir,

I'm so sorry to read that you have not had a good experience with the b'Twin Rockrider 500 mountain bike.

It is unacceptable that the saddle and the pedals were loose. Could I kindly ask you to email the name of your local store? This would be appreciated.

The Rockrider 500 is a perfectly suitable bike for mountain biking on trails. Agreed, it is not designed for hardcore or regular off road use but you can comfortably use it under normal off road conditions as it forms part of our "sport MTB" range.

Thank you for taking the time to give us your feedback. It is very much appreciated.

I look forward to hearing from you.


Peter Lazarus

UK Market Manager - Decathlon

Pretty Good

Comfortable, suspension



  (United Kingdom)


4 5

Seems good so far, ive spent a couple of hours on woodland tracks and 16 miles by road and both were comfortable.
The gears need adjusting and the brakes could be tighter but that just requires a trip back to decathlon.

My colleague is getting one after my recommedation

Excellent Bike

Great and good for all kind of biking

Should come with 28" wheels pls.


  (United Kingdom)


5 5

Very good bike,

To be Continued

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.