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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 - %

From £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

12 reviews

11 people recommend this product

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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

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

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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