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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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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

4.4 / 5

8 reviews

7 people recommend this product

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Good.....or Great?

Looks, manoeuvrability, ruggedness, build quality



  (United Kingdom)

50-59 years old    Man

5 5

used for 2 to 8 weeks There are only two choices in this referendum: whether this bike is Good, or whether it is Great! But first of all, it is a bike, with characteristics that have lived with bikes for 120 years. Like us humans, they need attention from birth and a £200 bike is no different from a £2000 machine. The 'rentamoaner' who didn't notice in mile number one that pedals were loose or saddle was insecure only has himself to blame. All too easy though to pass it on and far easier than following rule no 1 for any new machine irrespective of price - take a few tools with you .
In its 'stealth grey' colour scheme, the Rockrider 500 is a definite looker - surprisingly standing out among more conventional reds and blacks. In XL size, it overwhelms the competition with its sloping top tube and black finishing kit. Up close and personal, there are interesting and effective touches. the frame sections mix circular with elliptical with quadrilateral, giving a distinctly modern and sophisticated appearance. The three rear control cables run along the top of the top tube visible to the rider, keeping them out of harm or dirt's way and giving it a clear 'machine like' appearance as would befit a classic vintage airliner.
On the trails, all the components stay firmly attached to the frame with no hint of rattling or shoddiness. There is only the slight hint of buzz from the steel riser handlebars, and that probably depends more on the riding surface than component quality. The saddle in grey plastic looks unforgiving and worthy of early upgrade: resist! It is surprisingly comfortable and mouldable to shape.
The front suspension forks are adjustable for weight, though it would take a fall into a ravine to compress them fully - the forks are firm, by some standards solid, but well damped and amazingly gentle in action and reaction.
The SRAM X4 drivetrain is a delight, giving positive and unmistakeably complete shifting on every change. Its indexing is perfect on both thumb-operated dual shifters. It is an entry level system, but the operating 'lag' reported in other reviews is not a hindrance, is in many ways a benefit and is consistent and endearing. When called upon, it will traverse any or all of its range of 24 gears effortlessly and without a jump.
Wheels are bombproof double rimmed with standard knobbly tyres. They will handle all in their path without issue, taking mud, sand, uphills, downhills and gravel in their stride.
All in all an excellent package. I have converted mine to B'Twin SPD pedals which I use with Rockrider shoes, adding to the tractive potency of the machine. At 14Kgs, is it weighty? Possibly, but it is an entry level bike. It has to put up with entry level people like me the committed roadie and all our imported incompetencies, so it carries its extra Kilo or so for good reason! No need to buy new as you improve though - that superb frame will take upgrades.
We have a result - this is a GREAT bike!

Response of the brand

Thanks for your detailed and really well thought our review.  Really appreciated.
I hope you keep enjoying your b'Twin Rockrider 500 Mountain Bike.
Peter Lazarus UK Market Manager DECATHLON

Great value all rounder

Price, specification, value for money , quality

None yet


  (United Kingdom)

30-39 years old    Man

5 5

used for 2 to 8 weeks A great model range mountain bike, gears work well and mean off road cycling is made easy, pre loads left front fork mean riding on or off road is comfortable coupled with the disc brakes gives you confidence in those tricky bits. All in all very happy I went for this bike and would recommend it.

Really good value for money

Level and quality of equipment for the price



  (United Kingdom)

30-39 years old    Man

5 5

used for 2 to 8 weeks Aluminium frame, fork, brakes, gears... all good quality.
And frame with a lifetime warranty !
At this price, a bargain, or an accessible gift !

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

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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