Rockrider 300 Mountain Bike - Black



Made for

occasional mountain biking.
The essential recreational MTB: sturdy steel frame, 21-speed Shimano drivetrain, all-terrain tyres, and V-brakes for more braking power.

Sizes guide

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Cycling comfortSteel frame and fork, comfortable material. Raised handlebar. Ergo Fit saddle.
EfficiencySturdy frame and fork. SHIMANO 21 speeds. Wide, durable rims.
PrecisionDual V-brakes for more braking power. All-terrain tyres.
Ease of useGrip shifters. Built-in chainring and derailleur guard.
Lifetime warrantyB’Twin offers a lifetime warranty on the frame, fork, stem and handlebar.
WarrantyLifetime warranty on frame, handlebar, stem, fork. 2-year warranty for parts (excl. wearing parts)
Technical Information

Recreational mountain bike geometry made from hi-ten steel with oversized tubes for increased durability. Three coats of paint provide frame with long-lasting protection. Available in 2 sizes. Lifetime warranty on frame.
Rigid fork made of curved steel for added comfort. Lifetime warranty on the fork.
No rear suspension.
Steel, triple-chainring chainset (22/34/42 teeth), with a sturdy plastic guard. Shimano TZ30 3-speed front derailleur. Shimano TY21 7-speed rear derailleur. Shimano TZ21 7-speed freewheel, 14/28 teeth. Microshift grip shifters for changing gears. KMC Z51 chain.
Aluminium 2-finger brake levers, V-brake callipers with helical springs: more powerful and progressive braking. Screws with anti-corrosion treatment.
Steel MTB handlebar, 580 mm wide.
Semi-raised steel 105 mm long MTB stem.
Aheadset headset: shock-resistant and rigid steering. B'Twin Sport 300 grips.
Exclusive, wider, "hammock" style B'TWIN ERGOFIT saddle for good distribution of pressure points to make it more comfy. OR B'Twin Sport 100 MTB saddle made from PU.
Seat post
Steel seat post, 25.4 mm in diameter, 300 mm long.
Single-wall aluminium rims with 36 holes for increased durability. Quick-release front hub for easy removal of the wheel (for repairs or storage).
26-inch all-round mountain bike tyres offer high performance on roads as well as excellent traction on trails.
VP platform pedals with bearings, offering excellent grip.
Comes with a derailleur and chain guard, bell, front and rear lights, and wheel and pedal reflectors. Frame compatible with a rear pannier rack, baby seat, stand, water bottle and bottle cage, front and rear mudguards, saddle bag, etc.
14.55 kg in size M without pedals.
1) The components seen on the bicycle in the videos may change from the actual product. 2) The bicycle will be delivered in 85% assembled condition. The directions for the cycle assembly will be sent via mail ( if you have subscribed). The tools for assembly are provided with the cycle only for online buyers. 3) The 3-month, free check up is valid only if the user is able to take the bicycle to a decathlon workshop.4) All bicycle accessories need to be purchased separately.
If you will need a spare part to be replaced, we have it all at our workshop. You will have to drop by our workshop to get your cycle serviced.
SizeM / L

WHEEL SIZE26 inches

WEIGHT14.7 kg in L w/o pedals

Life warrantyFrame, fork, handlebar

SUSPENSIONNo suspension

Information / Concept / Technology
Frame : 100.0% Steel

Product test
We also advise beginners to wear cycling shorts with a protective pad and/or use a gel saddle cover to improve comfort.

Stockage tips
Store in a cool, dry place. Keep your bike away from corrosive products and salty air.



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Used for More than 2 years
Nice one
Used for 2 to 8 weeks
Cycles is OK.... Seat is not comfortable even I bought gel cover. I didn't get the back reflector. Later I contacted to the service person he is not ready for provide it. He says should have check before leaving the shop..... Who have the clear knowledge about the accessories getting with the bike ??? They are not giving the basic value for customer who purchased it for 12000/- with minimum accessories. I felt this dealing was not good.
Very Good Bike
Verified purchase What is a review "Verified purchase" ?

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The label "Verified purchase" lets help you judge the reliability of a review.
Amazing Experience, Very Good range in the store.
cool cool cool cool cool cool cycles btwin produce
Used for 1 week or less
I don't even know how do they manufacture such fine products.I have an btwin rockrider 300.hybrid.It's really cool!
Super awesome I love it
Its one of the best cycle in terms of cost and product.
Bike is good but have problems
Used for 2 to 8 weeks
I bought this bike (rock rider 300 mountain bike black)21st of January 2017. My height is 186 cm and with shoes it will be 187 cm . Your guy told me (as I didn't have knowledge about it before) that medium size will be good for me but after using it for 10- 15 days I am getting that large size would be good for me as I am getting pain in tailbone as well in my shoulders and biceps. Initially I thought pain is because that I am cycling after a long period of time but this pain is increasing day by day .
Used for 1 week or less
I faces some small issues like the AIR goes out automatically once a day but there was no puncture in the tube. Also the handle bar is not comfortable as I felt pain on the second day itself. I am still scared about the flat Tyre, may be it can happen again aN another day as no fault was found earlier in the Tyre
Painting is not good
Used for 2 to 8 weeks
I took new cycle rockrider 300 on 2017 Jan 5 but painting use not good/satisfied with painting but whatever new cycle is to be good na so I'm not satisfied with painting but we should do now
More grip
Painting is not good
Best Leisure MTB for the price
Used for 2 to 8 weeks
When i started looking for a bike, B'TWIN was not on the list. But, when i thought about the availability and my budget, most of the cycles on the list were knocked out and B'TWIN 7S was added and i finally decided to try each one of them. I visited the Decathlon @kalamassery, Cochin. The plan is to try or buy 7S but my eyes are locked in the Rockrider 300. When i test ride both, Rockrider 300 found to be more matching and practical for my purpose. I bought the most shining one from their shelf and rode it back with a torn pocket and a happy heart. I ride it everyday at morning and to office. Go Green, Save Earth, Make Health.
Smooth riding, Awesome brakes
Not easy to shift gears.