Rockrider ST520, 27.5" Mountain Bike
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San Francisco, 735 Market St. Options
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Raised position. Ergonomic saddle. Height-adjustable stem. Soft-touch grips.
CGF Evo aluminum frame. 24-speed SRAM X3. Light, 27.5" Aero Trail Evo wheels.
Dual disc brakes. Easy handling frame geometry. Tires have good grip in turns.
Innovative fork with easy adjustment based on rider's weight.
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The RockRider 520 was designed and created in Suzhou, China, by a team of experts and cycling enthusiasts dedicated to designing our MTB Sport Touring line. Production was also done near Suzhou to be as close to our Decathlon stores as possible.
Rockrider CGF Evo (Comfort Geometry Frame) 6061 aluminum frame for 27.5" wheels. Comfortable seating position thanks to raised steering. Seat is 5 times more flexible than a standard frame thanks to a narrow 1.07-in. seat post. Low bottom bracket: helps keep the mountain bike stable in turns, and makes it easier to place foot on the ground. Open steering angle (69.5°): keeps mountain bike stable while riding. Short rear wheel base: bicycle is easy to turn. LIFETIME WARRANTY on the frame!
B'Twin U-Fit 80 fork, with 3.15 in. of travel and an innovative fork stiffness adjustment based on the rider's weight (121 to 230 lbs.). Durable thanks to the materials and fabrication processes used. Equipped with a mechanical spring and elastomer stoppers for maximum reliability and minimum maintenance.
No rear suspension.
SRAM S200 triple-chainring chainset (22/32/42 teeth). SRAM X3 8-speed rear derailleur. Microshift MS22 front derailleur. SRAM X4 shifters with speed indicators. SRAM PG820 cassette, 8 cogs, 11 to 32 teeth.
Tektro aluminum brake levers: lightweight and precise. Front and rear Hayes MX5 mechanical disc brake calipers: powerful, progressive braking, even in rainy and muddy conditions.
B'Twin Sport Oversize aluminum handlebar; 25.9 in. (Size S and M), and 26.7 in. (L and XL). Exclusive B'Twin aluminum stem, 70 mm (size S and M), and 80 mm (size L). Stem can be raised by up to 1.2", with 5 settings (+0", +0.3", +0.6", +0.9", +1.2"). Semi-integrated A-headset—better sealed and integrated style. B'Twin Sport handles with grooves, 4.72 in. long: genuine comfort while riding.
Aero Trail Evo aluminum wheels with double-walled rims: lightweight, stiff, and durable. 27.5" diameter: the best balance of comfort and performance. Designed with 28 spokes to reduce weight while still ensuring rigidity and strength.
Exclusive B'Twin All Terrain Dry 27.5" x 2.0 tires with a central tread specially designed for fast performance. Side lugs provide traction in turns. Also includes a chart showing recommended pressure levels depending on the rider's weight (see markings on tire sidewalls).
Exclusive B'Twin Ergofit Evo saddle offers outstanding comfort thanks to its wider "Hammock" cut and good distribution of pressure points regardless of the rider's pelvis width. B'Twin Sport seat post in aluminum for less weight. 1.1". diameter provides the seat with a natural flex that's 5 times greater than a classic seat post. 400 mm long, offering a broad adjustment range.
Bicycle comes with mountain bike platform pedals with bearings, made from hard resin for lower weight and greater safety (less aggressive in case of pedal that slips).
31.63 lbs in S without pedals. 31.8 lbs in M without pedals. 32.1 lbs in L without pedals.
Frame can take a bottle cage, saddle bag, mud guard, stand, pannier rack.
We also recommend that beginners wear cycling shorts with a protective pad and/or a gel saddle cover to reduce soreness.
Store in a cool, dry place, away from corrosive products and salty air.
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Rockrider ST520, 27.5" Mountain Bike
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Heavy products return policy
If you return a product you will receive a refund for the purchase price plus any applicable sales taxes, less any non-refundable charges.
Decathlon will cover all shipping costs associated with your return except for items excluded from our return policy such as bikes, basketball hoops, snowboards, surfboards, tents, and other larger / heavier items.
Return costs for heavy products:
|Weight Thresholds||Shipping within California||Shipping outside of California|
|> 9 lbs||$20.00||$25.00|
|> 30 lbs||$50.00||$65.00|
|> 100 lbs||$100.00||$125.00|
|> 200 lbs||$200.00||$230.00|
If you return a product at any of our store locations, we will gladly help you find the best alternative product or refund you on the spot.