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B'TWIN Rockrider 520 Mountain Bike

The Rockrider 520 hardtail MTB from b'Twin is a fantastic value for money mountain bike. With it's lifetime warranty 6061 alloy frame and excellent spec it really is built to last and will always put a smile on your face. The XCR lockout forks and Tektro AURIGA Comp 160 mm hydraulic disc brakes will keep you in control and added to the Shimano Acera 27 speed gears you can be confident that many miles of mountain biking on the trails will be fully rewarded. To view our full range visit our mountain bikes category.

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until £330.00 -24 %

From £250.00**

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From 24/12/2015 To

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** Sales from 23/12/2015 to Until end of stock

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* From 24/12/2015 and limited stock
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Reference : 8293188
Cycling comfort Raised position. Lamellar 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.
Wheel size
26 inches
13.4 kg in S without pedals
frame, stem and handlebar
100 mm suspension fork
Grey / White / Red

4.3 / 5

47 reviews

40 people recommend this product

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Simple The Best


  (United Kingdom)

Under 20 years old    Man

5 5

used for 2 to 8 weeks Best Performance For A Better Price

Amazing Bike

strong build..light wieght



Under 20 years old    Man

5 5

used for 3 to 6 months Great bike to ride...handles well in trails....gets around very well...The 26' wheels coupled with a sport geometry makes for responsive handling....Hope you guys bring fork upgrades..a 120mm fork would fair better

Rockrider 520


  (United Kingdom)

40-49 years old    Man

4 5

used for 2 to 8 weeks Excellent value for money, especially at the sale price.

Poor specifications compared to older RR 5.3

Brakes, frame

Shifting perfomance


  (United Kingdom)

20-29 years old    Man

3 5

used for 3 to 6 months Some owners have already mentioned their gripes with the shifting performance. The 520 replaced the older 5.3 which was a fantastic bike with a full SRAM X5 system.

Why did B'twin feel the need to put Acera and Tourney (!) at this price point? What differentiated you from the other companies was the incredible value you gave. Now you are just an also-ran. Disappointing!

Response of the brand


The reason the bike was changed from SRAM X5 from the old 5.3 to the Acera was because of SRAM X5 going to 10 speed and the price of the components would increase the price of the bike. Having used both Acera and X5 I felt the Acera had a must crisper feel to it rather than the X5 (even after prolonged use) of the old 5.3. Gearing issues tend to be of a setup issue rather than quality of the product/groupset.

Rob Basnett b'Twin Product Expert DECATHLON

Awesome bike

Everything, just incredible spec for the money

Not found any


  (United Kingdom)

50-59 years old    Man

5 5

used for 2 to 8 weeks Bought as a birthday present for my 16 yr old son. He's 190cm tall & thinks this is by far the best bike he's ever had. I've tried it out & like it so much that I'm considering getting one for myself.
Spec level off the chart for the money, nothing we looked at even came close on any other website.
The service & delivery from Decathlon was exceptional too. I haven't used them before, but they have just become my favourite site to visit.

An error has occurred
Frame BTWIN SPORT MTB frame, in strengthened, 6061 aluminium.
Sports geometry, perfect for intensive mountain biking.
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 long-lifetime.
Suspension No rear suspension.
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 cassette 11 X 32.
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).
Handlebars Rockrider SPORT handlebars with oversized diameter: oversized diameter for greater stiffness and more accurate steering.
Width from 600 mm (S) to 640 mm (M, L and XL).
Stem Oversized Rockrider SPORT stem (oversized diameter), with a 6° rise. Length: 90 mm (S), 100 mm (M) and 110 mm (L and XL).
Steering Aheadset Rockrider SPORT headset, 1⅛".
Saddle Rockrider SPORT LIGHT saddle.
Seat post Rockrider SPORT seat post: diameter 29.8 mm, length 350 mm.
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.
Tyres Hutchinson Python tyres with versatile profile: a market benchmark.
Pedals Wellgo MTB platform pedals with toe-clip for holding the foot firmly in place.
Accessories Possibility to add accessories (bottle cage, mudguards, bag under the saddle, pannier rack at the rear, etc.).
Weight 13.4 kg in size S without pedals.
Electric assistance No electric assistance.
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 tightened properly.
Guarantee : Frame, handlebars and stem have a lifetime warranty. 2-year warranty for parts (excl. wearing parts)