Made for Occasional mountain bike sport touring.
The first true touring mountain bike: comfortable thanks to a more upright seating position and front suspension, efficient thanks to a lightweight aluminium frame and Shimano 21 speeds.
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Cycling comfortRaised position. Ergofit ergonomic saddle. 80 mm front suspension.
EfficiencyAluminium frame. 21-speed Shimano.Wide rims, tyres suited to faster terrain.
PrecisionDouble V-brakes: powerful and lightweight. Tyres have good lateral grip.
Ease of useGrip shifters. Built-in chainring and derailleur guard.
Lifetime warrantyB'Twin offers a lifetime warranty on the frame, stem and handlebar.
WarrantyFrame, handlebar and stem have a lifetime warranty. 2-year warranty for parts (excl. wearing parts)
Technical Information

Exclusive Rockrider 340 frame with a raised steering position for multi-purpose use. Made from reinforced 6061-T4T6 aluminium that combines durability and low weight. "Sloped" unisex frame geometry is suitable for both men and women. Painted with 3 coats of paint and varnished designs for long-lasting protection.
Suntour XCT fork with 80 mm of travel and a stiffness adjustment dial.
No rear suspension. Weight adjusting front suspension.
Triple-chainring steel chainset (22/32/42 teeth) with a plastic guard. Shimano TY21 7-speed rear derailleur. Shimano TZ30 or Microshift MS22 front derailleur. SRAM MRX21 grip shifters with speed indicators. Shimano TZ21 cassette with 7 cogs, 14-28 teeth. KMC Z51 chain, wide for greater durability.
Front and rear V-brake system with a helical spring for more powerful braking. Aluminium MTB brake levers that require only 2 fingers to operate.
Semi-raised mountain bike handlebar for added comfort while riding. 600 mm wide steel handlebar that combines comfort and stability.
Aluminium stem, 90 mm (XS / S / M) or 110 mm (L / XL), with a 10° angle for maximum comfort.
Aheadset-type headset for greater resistance to impacts and rigidity in turns. B'Twin Sport 300 grips have a soft-touch finish for better grip and to extend the grip shifters.
B'Twin Sport 100 saddle with high density foam for added comfort.
Seat post
Steel MTB seat post with a 29.8 mm diameter and 350 mm long.
B'Twin Alloy Single Wall 26" wheel with single-walled rims. Wide for longer-lasting durability. 36 spokes for greater resistance to impact. Quick-release on the front wheel for easier maintenance, transport and storage. Lock nut on back wheel to reduce risk of theft.
New Ralson Mountain Bike 26" x 1.95 tyres. High-performance tyres with buttons best suited for on road and short trails.
Flat mountain bike pedals with bearings, made from hard resin for less weight and added safety (less aggressive in the event of a slippery pedal).
14.85 kg in size M without pedals.
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.
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.
Information / Concept / Technology
Frame : 100.0% Aluminium

Product test
We recommend that beginners wear cycling shorts with a protective pad and/or a gel saddle cover to reduce soreness.

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

Maintenance tips
Regularly maintain your fork (clean and grease dampers), especially in winter. Take your bike to your Decathlon store's After-Sales Service, which offers a free safety inspection on all new bikes purchased.



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Best and only one minor adjustment left
Used for 1 week or less
The bike is really good. Thanks to decathlon for their after sales service . They made me fully satisfied with the cycle .. best cycle .. only the front rim where it is joint from the first day it's not straight .. mostly a minor adjustment becoz if u use brakes. Front then it gives a tat sound every rotation (while using slowly). Actually this cycle I got as a replacement due to some manufacturing defects in the other rockrider 340 .. thanks a lot decathlon .. customer satisfaction is the main thing for u people .. I appreciate it .. especially thanx to decathlon Whitefield for their professional service .. Of their btwin team and the department manager..
Awesome cycle
Used for 3 to 6 months
Awesome and superb cycle.excellent for trekking and fantastic gear mechanism and double v breaking best model for btwin on that amount range
Highly dissatisfied with bike and service
Used for 3 to 6 months
I bought this bike on 3rd July. I am a regular customer at decathlon zirakpur and buy lot of gym accessories from there. However, to improve my cardio function, i decided to buy a bicycle and ended up with rockrider 340. Since then i have faced following problems:-
1. The gears started giving problems a month after i bought the bike. There is a massive problem while moving the left shifter from 2nd to 3rd level as i move from 5th to higher levels on the right shifter to up the speed. The gear does not shift smoothly, there are cracking sounds and i fear it may lead to chain damage and bike may break down at any moment.
2. I recently started getting this weird vibratory noise from pedal which comes each time the wheel completes one rotation. I am not an expert on this but there is definitely a problem there.
3. The service has also been disappointing. For my first free service, i dropped my bike at decathlon store around 11 am. I was told that the service guy comes around 12 pm and you can pick up the bike around 2 PM. I called the store around 5 PM and to my surprise the bike was not serviced even then. As i wanted the bike back in evening, they asked me to pick it up by an hour. I had already informed them about the gear problem. However, 2 weeks after the service, the gear shift problem is back. To add to my woes, a day after servicing, the front brake went loose, putting me at risk while riding. As an emergency measure, i took it to a bike store of another prominent brand and the kind mechanic over there fixed it. A fault in bike a day after service really raises doubt on the quality of service.
4. At the different bike store, i could notice that i could have bought similar bike in the same price range with additional features such as disk brakes. Not to mention, this bike store being in city limits and easily accessibly for a service rather than decathlon zirakpur, which is way out of chandigarh city.
Most importantly, i am facing these issues despite driving on neat and top notch quality roads in chandigarh (Vigyan path and Madhya marg). The bike has been only driven by me and never taken off road or for a rough ride.
DO NOT buy this bike !! If it gives issues to me on a smooth track, it will give issues to everyone. And for all those who have decathlon stores far away, its another reason not to buy as you can not take bike to store every other day for repair.
Response of the brand
Hello Sanjil, 

Thank you for taking the time to give us your review. Apologies for the bad experience you have had with the product. The gear shifting problem has occurred due to the tuning of the shifter. It can be fixed in the workshop. The sound from the pedal needs to be looked into because if the pedal arm of the pedal is broken, we will have to replace it. 
I will give a direct feedback regarding the service experience you have faced to the workshop so that we can improve on the processes the next time. Please let me get in touch with the Zirakpur store to get the best solution. 

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Used for 2 to 8 weeks
I would like to thank the Deacthlon Indirapuram team for their support and suggestions for my Btwin Rockrider 340 bicycle. The bicycle is really comfortable and smooth. Wishing you all the best for future.
saddle is uncomfortable and rims are corroded
Used for 1 week or less
i bought it from decathlon Ludhiana 2 days ago. saddle is too hard to sit on. and i found that rims are corroded. apart from it everything else is great about this product.
AUSUM loved it
Used for 7 to 12 months
IT is an best bike for little money very nice bike
first day experience
Used for 1 week or less
received the bicycle . the front wheel was missing the tightning key and the axel provided was shorter had to fix it from local shop. the bicycle is just perfect to use.
Good bike but issue with the seat
Used for 1 week or less
I just bought the Bike the day before and looking at beginning cycling on a regular basis. Am looking at mostly riding it on city roads and an occasional trail.
While the bike rides smoothly, I don't find the seat comfortable at all. Even after putting a cushioning seat cover. It's probably because the seat is too small. Is it possible to replace the seat with another Btwin seat which is wider and more comfortable?
Its good for small trips
Used for 7 to 12 months
I m using it since 5months and I enjoyed cycling for100 and above 120kms also initially it was working good but now it's giving an irritating sound and I've seen decathlon twice but they are unable to rectify and said that its made for up to 20kms only and I was hurt hearing this so I don't wanna it to be the situation with u guys also
Response of the brand
Hello Sandeep, 

Thank you for taking the time to give us your feedback. Apologies for the wrong information provided. The bicycle can be ridden on distances which best suits the cyclist. What I meant by that is, the bicycle will go as far as the cyclist wants to go. The Rockrider 340 can be used for long distances, provided it is serviced at regular intervals. Any problem related to the bike must be addressed at the earliest to prevent other parts from wearing out as well. The drive train problems can arise depending on usage. It can definitely be fixed in the workshop. I suggest you do give it a shot again explaining what I have mentioned do let me now if your problem is still not solved. I remain available. 

Deepak BABU
Best Best Best
Used for 2 to 8 weeks
Using rockrider 340 since 3 weeks. Best bike for city as well as offroad touring. Charming looks, very comfortable to ride. Feel of owning a premium product. Gear shifting is not bad, actually you need to get used to its settings, don't expect that if gear shifter points at 2 then bike is on 2nd gear, it may need a twist upto 2.5 and likewise. Even I had a complaint of pain in crotch bone on first day, I blamed saddle and its hardness but I read some opinions on this and continued cycling and found that, those who are cycling after a gap of more than a year may have this problem but continue cycling, the pain will vanish.