Rockrider 340 Mountain Bike - Orange



Made for

Adults who are looking for city commute, occasional mountain bike and sport touring. Front suspensions give you added comfort.
The first true touring mountain bike: comfortable thanks to a more upright seating position and front suspension. A lightweight aluminium frame and Shimano tourney 21 speeds.

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Cycling comfortRaised position. Ergofit ergonomic saddle. Innovative front suspension, 80 mm.
EfficiencyAluminium frame. 21-speed Shimano.Wide rims, tyres suited to faster terrain.
PrecisionDual V-brakes: powerful and lightweight. Tyres have good lateral grip.
Ease of useInnovative fork adjustment system based on rider's weight. Grip speed shifters.
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. Reinforced 6061-T4T6 aluminium that combines durability and light weight. "Sloped" unisex frame geometry is suitable for both men and women. Three layers of paint and varnished decorations provide lasting protection.
B'Twin U-Fit 80 fork, with 80 mm of travel: Innovative fork stiffness adjustment based on rider's weight (55 to 105 kg). Durable thanks to the materials and fabrication processes used. Mechanical spring with an elastomer stopper for maximum reliability and minimum maintenance.
No rear suspension. 80mm Front suspension.
Triple chainring steel chainset (22/32/42 teeth), with a plastic guard. Shimano tourney 7-speed rear derailleur. Shimano TZ30 or Microshift MS22 front derailleur. SRAM MRX21 grip shifters. Shimano TZ21 cassette with 7 cogs, 14-28 teeth. KMC Z51 chain, wide for greater durability.
Front and rear V-brake braking 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.
Exclusive B'Twin Ergofit saddle with a wider "hammock" shape that evenly distributes pressure, resulting in a more comfortable seat.
Seat post
Steel mountain bike seat post with a 29.8 mm diameter and 350 mm long.
B'Twin Alloy Single Wall 26" wheel. Wider for greater durability. 36 spokes for greater resistance to impact. Quick-release on the front wheel to make it easier to maintain, transport and store. Lock nut ( no quick release) on the back 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.
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.
SizeS / M / L

Wheel Size26 inches

Weight14.85 kg

Life warrantyframe, stem and handlebar

Suspension80 mm suspension fork

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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Poor quality. Go for other brands
Used for More than 1 year
I was riding my bicycle and the rear derailleur just came off the cycle which made me lose control and it almost killed me.

The reason for this was the poor quality of the derailleur (and it's made completely of plastic by the way). The rear derailleur is a shimano tourney which is the cheapest in the shimano line up. Now the funny part is at the store they told me that the whole drive train needs to be replaced, costing me INR 2800!!! And also nothing but the frame is covered under warranty BTW. My cycle is just one year old!

I don't understand why a sparingly used, one year old cycle needs so many parts to be replaced! I have had bicycles from other brands that I have used for years, without a hiccup.

The reason for all this is mainly due to the extremely poor quality parts used in your bicycles and poor service. I never expected this from Decathlon as I always looked up to Decathlon as a beacon for quality products.

Anyway, I'll have to pay the money and get the work done as I have no choice and I'm stuck with this bicycle now.

But I thought I'll let people know that these bicycles are of really poor quality and you are better off spending your money elsewhere.
Response of the brand

Hello Suraj,

Thank you for taking the time to give us your review. The rear derailleur can get stuck in one of the 3 cases written below. 
1) When the Gear ratio used was wrong. (riding with 1 on the FD and 7 on the RD).
2) When the drive train is not well lubricated over a period of time,  there are chances that the chain gets stuck at a particular teeth resulting in the RD getting extended and finally breaking away. 
3) If the gear shift was too quick with very slow / no pedaling, the chain will get jammed and the RD may break. 

The old model of the Rockirder 340 had Shimano TZ-30 as its rear derailleur. We had few complaints and we did upgrade it to Shimano tourney after listening to our users because Shimano Tourney is an upgraded from TZ-30 specially in performance. We did keep the bike at the same price even after the upgrade. 

Our every intention is to give good components at the best price quality ratio, resulting in a bike that is affordable and performance oriented in its category. 

As a solution for the problem I would suggest you to change only the RD. The total cost is 1099/- which includes the derailleur + labor cost.  Please advice us if you got a quote of 2800/- for only replacing the derailleur or does it include a full service from the workshop. We would like to get in touch with the store to clarify and resolve the problem.  
outstanding cycle
Used for 2 to 8 weeks
i bought the cycle 3 weeks ago its very good i reccomend cyclers to buy this cycle
After Washing, Color was faded
Used for 2 to 8 weeks
I owned Mountain Rock 340 in month of July at 2nd week with lots of excitement . One day i was getting surprised , when i washed 1st time with normal water , results frame of cycle bleeds red mix orange colored water. at time of 2nd time washing, it happened same problem. and frame color was faded.How ever there usually face a minor problem at time of shifting gear and breaking.
Response of the brand

Thank you for taking your time to give us your review. I check the bikes in the layout for the same and there was no color bleeding. Is it possible for us to get the bike for a study as to why it happened on your bike? Request you to let us know in advance as to which store you will be taking the bike in order for us make the necessary arrangements in the store. We will also check the derailleur and shifter when you are at the store. 

Good bycycle.
Frd disc brake
very satisfied
Verified purchase What is a review "Verified purchase" ?

Where review is marked as "Verified purchase" confirmed by Decathlon, this means that we could verify that the client who filed this opinion has purchased the product from us.

We can confirm purchases for the reviews expressed on a request by e-mail after purchase or when the customer has this review from his personal space.

If review is not marked as "Verified purchase", this does not mean that the author's review has no experience with the product may have given his review directly on the site without unique identification, or the product has been offered or paid.

The label "Verified purchase" lets help you judge the reliability of a review.
Good quality. A little costly but worth it. Can we lighter for an aluminum frame.
Awesome product
Used for 3 to 6 months
It is good one with riding comfort
I had been using for 4 months. I travelled more than 300 km .good one.price of worth
The Beast with the Best
Used for 1 week or less
An awesome bike with 21 speed shimano grip shift.It is awesome but the pedal of the bike has many solpokes which they poke sometimes if we ride wearing shorts.And it stucks sometimes while riding. The look is Awesome and has many colour ranges and it's a cool product.But we need to have to adjust spare parts in Decathlon itself like Stands, Mudguards,Led etc.But good and worth for money.
Gear shifting is good and brakes are extra ordinar
Used for 3 to 6 months
I felt dissapointed when i saw my chain cover comingout.after that that whole chain cover came out.can any one help me to find that chain cover.the chain cover is poor.otherthan that everything is okay.please help me for finding the chain cover
It's a Beast
Used for 3 to 6 months
I purchase this cycle past three month before so fare i ride more then 600km. i recommend this cycle for others saddle should be improve while i riding i feel not a comfort to ride more km and the when change the gear to 3*7 i hear some noice in chain otherwise its a best one to buy.. To be honest its a Beast
Best one for this price
poor saddle
Worth of money
I purchased it on last week and till today its performance is very good. I can recommend the same to others.
Team, please guide me regarding the free check up of my new bike.
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