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Hydraulic disc brakes: Greater efficiency

All Bikes Cycling - Rockrider 520 Mountain Bike B'TWIN - Bikes
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B'TWIN Rockrider 520 Mountain Bike

Intensive mountain biking.

To view our full range visit our mountain bikes category.


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From £330.00**

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Price in store £0.00 £330.00 **

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Free delivery with Click & Collect
From : 01/12/2015 with this item
Reference : 8293188

Delivery Info: When buying a bike online, pedals are not fitted and the stem/bars are not adjusted. View this video to see how to correctly set up your bike at home.

Our customers pictures

Product benefits

    • User comfort
    • Raised position. Ribbed grips. Covered saddle. 100 mm fork.
    • Efficiency
    • Double hydraulic disc brakes. Forks with lockout feature. 27-speed SHIMANO.
    • Ease of use
    • Lock your fork by hand in an instant.
    • Lifetime warranty
    • B’TWIN guarantees the frame, stem and handlebars for life.
    • Precision
    • HUTCHINSON Python tyres: A golden standard in grip and performance.
  1. Guarantee : Frame, handlebars and stem have a lifetime warranty. 2-year warranty for parts (excl. wearing parts)

Product information

S: 150-165; M: 165-175; L: 175-180; XL: 180-195
Black / White / Red
Wheel size
26 inches
Suspension fork
13.4 kg in S without pedals

your reviews

4.2 / 5

39 reviews

33 people recommend this product

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520 Rockrider...all good...except for gear shifts

Handling and the finish

gear shifting



20-29 years old    Man

2 5

used for 1 week or less Hello,
I purchased the 520 Rockrider a week ago....Delivery was on time....the cycle came in a mint condition....all good.. ..the only problem was in the gears....the chains squeaks and sometimes the gears does not shift well...specially during uphill....its makes a crack sound and peddles jerk.....
I bought this from Noida,India

Response of the brand

Hello Mohit,
Thank you for taking the time to give us your feedback. 
The rockrider 520 is indeed a good bike with a nice matte finish paint job.
The problem of the shifting can be resolved. The drive train needs some fine tuning so that the shifting is spot on. This is done at any decathlon store at the workshop section. Please let me know if the bicycle was bought from Decathlon Noida store or any other channel at Noida. If it is from our store, I will inform the store about your situation whenever you visit and we can resolve the problem.

Deepak Babu E-sport manager DECATHLON

Non availability of spares

They don't keep spares , wait for a week or two



40-49 years old    Man

1 5

used for 3 to 6 months Btwin is a good cycle , but been sold through a wrong channel , the service and response is too poor , spares availability is low and may take a one to two weeks to arrange spares , the commitment level is extremely poor

Response of the brand

Hello Rajeev,
Thank you for taking the time to give us your feedback. We are sorry for the bad experiences you have had with our spares availability.  Please let me know which spare is that you are looking for. We can arrange it for you. The only instance when  it takes time for us to get the spare part is when we try to ship it from an other state.  Other wise all spares for btwin bikes are available at our store.
Deepak Babu E-sport manager DECATHLON

Rajeev did not find this review helpful

Very disappointed


  (United Kingdom)


2 5

used for 1 week or less Not happy with the Bike. The gears/chain keep slipping. Hurt my knee as the chain slipped when on an incline. Also disappointed with the store as the bike wasnt setup properly (Shifters, Saddle etc). First time into MTB and so didnt have a clue when I bought it. All that was done was a 2 minute checkup. All in all very disappointed.

Response of the brand

Dear sir,
I'm sorry to read that the gears are slipping on your bike. A few simple adjustments by the local store will be able to resolve this in a matter of minutes.
I have contacted the store and they will be in touch with you to resolve all the outstanding issues and to listen to your experience.
Peter Lazarus UK Cycling Market Manager DECATHLON

The chain has many problems

Chain slips and can't use all gears!


  (United Kingdom)

40-49 years old    Man

2 5

used for 2 to 8 weeks Ive had the rock rider 520 for a few months now. Ever since I got the bike more and more problems occur. In the shop the bike is prefect but once it's out and being used his hills the chain slips causing my to slip off twice.
The bike chain only slips on hills really it's happened around 50 times now and I've found the bike to be getting worse.
Getting onto the next problem. The gears down all work. I've been in to see you 3-4 times now and it works prefect in the shop as the previous problem then it doesn't once home riding. Each time I've been in you have looked at it and spent 4-5 hours messing around with it then sending me home which isn't right because I payed for a quality bike and service and I'm not getting it. I Want this problem fixing or a upgrade to the next bike being as this is unacceptable!

Response of the brand

Dear sir,
I'm sorry to read that you're experiencing regular issues with your Shimano Acera gears.
So many things can affect the quality of the shifting. It may be best that we strip down your drivetrain and start again or provide you with a new bike. There is no reason why your local store can't do this for you.
Here is an interesting article on the subject:
Please contact your local store and we can arrange to find a solution which suits you best.
Peter Lazarus UK Cycling Market Manager DECATHLON

Rockrider 520

Look/weight/quality/performance/delivery ect ect



  (United Kingdom)

40-49 years old    Man

5 5

used for 3 to 6 months WOW I have bought a few bikes over the years and this is miles ahead in quality! The look is epic .a real head turner:) the delivery was super fast and friendly van man ) the gears were all set up all I had to do was lift it out or the box and attach the handlebars took 2 mins and it was ready to rumble :O) I am so happy with this purchase best investment ever >>> looking forward to many miles in style 110% reccomended

Technical Information

  • 1

    Frame B'TWIN SPORT MTB frame, in strengthened 6061 aluminium.
    Sports geometry, perfect for intensive touring.

  • 2

    Fork Rockrider XCR 100 mm lockout fork by SR Suntour.
    Lightweight and durable hydraulic fork cartridge.
    Preload adjuster and lockout.
    100 mm travel.
    Magnesium fork blades.
    The damper finish ensures a long lifetime.

  • 3

    Suspension No rear suspension.

  • 4

    Drive train MIRANDA BETA BLACK aluminium 22x32x42 crankset;
    Shimano X50 or Microshift M30 front derailleur;
    Shimano ACERA rear derailleur;
    Shimano ACERA 9-speed shifters;
    SRAM PC951 chain;
    PG950 9-speed 11 x 32 cassette.

  • 5

    Brakes AURIGA Comp 160 mm hydraulic disc brakes at the front and rear for greater braking power and precision, even in extreme conditions (e.g. mud).

  • 6

    Handlebars Rockrider SPORT oversized handlebars: oversized diameter for greater stiffness and more accurate steering.
    Width from 600 mm (S) to 640 mm (M, L and XL).

  • 7

    Stem Oversized Rockrider SPORT stem (oversized diameter), with a 6° rise. Length: 90 mm (S), 100 mm (M) and 110 mm (L and XL).

  • 8

    Steering Aheadset Rockrider SPORT headset, 1⅛".

  • 9

    Saddle Rockrider SPORT LIGHT saddle.

  • 10

    Seat post Rockrider SPORT seat post: diameter 29.8 mm, length 350 mm.

  • 11

    Wheels RIGIDA SPHINX 32-hole, double-walled rims.
    Watertight Formula DC19/DC22 disk ready hubs,
    2 mm diameter stainless steel spokes: impact and corrosion-resistant.

  • 12

    Tyres Hutchinson Python tyres with versatile profile: a market benchmark.

  • 13

    Pedals Wellgo MTB platform pedals with toe-clip for holding the foot firmly in place.

  • 14

    Accessories Possibility to add accessories (bottle cage, mudguards, bag under the saddle, pannier rack at the rear, etc.).

  • 15

    Weight 13.4 kg in size S without pedals.

  • 16

    Electric assistance No electric assistance.

Information / Concept / Technology

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 hosing every three months and ensure screws and nuts are tightened properly.

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