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Rockrider ST540 Mountain Bike 27.5"
Mid-level Sport Trail mountain bike hardtail
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Final Sale: No returns or exchanges
See our return rules for heavy items
Free pickup
San Francisco, 735 Market St. Options
Select an available color and size to see options.
About this item:
- Yield: Roll efficiently with 27.5” wheels, 18 speeds, and lightweight tires.
- Trajectory control: Manage your trajectory: hydraulic disc brakes, tires and wide handlebars.
- Driving comfort: Enjoy the raised position, adjustable stem, 100mm suspension and hammock saddle.
- Ease of use: Block the fork with a simple gesture and effortlessly adjust your saddle.
- Lifetime warranty: ROCKRIDER guarantees the frame, stem and handlebars for life.
Product Videos
Product Features

Cycling comfort
100 mm hydraulic fork (smoother). Ergonomic saddle. Height-adjustable stem.
Efficiency
Shimano 2Ă—9 speeds. Lightweight, fast tires. Fork with lockout.
Easy to use
2Ă—9 speeds, hydraulic disc brakes, suspension fork
Questions & Answers
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Product Customer Reviews

The derailleur is faulty and very dangerous. when you force uphill the chain kicks like if it was unadjusted. I had the bike serviced twice at decathlon and it still does the same thing. Either the mechanic lacks knowledge about repairs or the derailleur is total crap. I like the bike but I will be upgrading the derailleur system.
love the 2x9 drivetrain and hydraulic disc brakes only down side was the xcr suntore fork it was loud and hed no rebound
Amazing bike for the money.
This is not a rievew but a request for information on the maximum riser weight for this bike?
This a very good bike. Just be careful if you purchase in store. As first day of riding this to work right pedal came loose and wobbly. Luckily I stopped straight away so it did not cause to much damage to pedal thread. Got other half to bring me a adjustable spaner and tightened it back up and pedal was fine after that. But after spending 470 pound and some one in store checking bike over then for pedal to come loose I was very very disguted. Ok. I use this bike for about a 8 mile journey to work. And it does a good job gears are nice and smooth breaks work great.. and now pedal is all sorted I'm very happy with the bike.. but like I say after spending that sort of money and for some one instore to check the bike over. You do not expect pedal to come loose. That experience was very very disappointing. The reason I got new bike is because I new it was a 8 mile journey. And on a new bike 2 miles in and the pedal is all loose and wobbly. You can imagine how angry I was. I would recommend this bike. But I would also recommend that check the bike over yourself before setting out on a big journey..
Hi Derek,
I understand that my colleague, Kyle, from the workshop has been in contact with you this morning regarding your issue.
We are sorry to hear that this has happened. We would like for you to bring the bike back to our store so that we can make sure that the pedal is okay. If there is any problems, we can replace the pedal for you without any further costs as you are still under manufacturing warranty. We will also the rest of the bike to ensure that everything is in working order.
We apologise again that this has happened to you. We hope to hear from you soon.
Kind regards,
Emily
Sports Advisor (Customer Service)
Decathlon Wednesbury
Decathlon UK Limited. Company number: 03140144. VAT number: GB679262296.
Registered office: 9 Maritime Street, London, SE16 7FU.
The member of staff that served us was extremely helpful.
Did a lot of research on hardtail bikes sub ÂŁ500 and this ticked all the boxes. I have used this on various trails and it is faultless
It’s really very good bike..service is awesome
I visited the Huyton store at around 5.30 pm on Monday 18th October in the hope of being able to ride out of the store with a ride ready bike. David the bike technician was fantastic. He was due to go on a break but instead showed me the Rockrider ST540 which I could tell was not ride ready as it had been on a display stand. David suggested I go and get a coffee and he would get the bike ready for me and sure enough when I returned the bike was ready and he had even fitted the rear mudguard too. I rode the bike home and to and from work the next day. The ride was great and the gears couldn't have been set up better. This is the second time in 2 years David has set up a bike for me as my last purchase was stolen recently hence the purchase. He is a credit to Decathlon as he always goes the extra mile for his customers and really knows his stuff. I would recommend David and the Huyton Decathlon store to anyone wanting to buy a bike
I was looking for a bike I could take off road, and enjoy when out and about. I absolutely love it, nice easy ride
Very impressed with this bike, will help to travel to work now instead of using public transport which has been really bad in the last few months.
Best bike ever. Only criticism is the handlebars a bit long
Very faulty product
Renewed bike after riding the same one for 24 yrs. This is a pleasure to ride and very comfy on all surfaces- road,mud,stone tracks and even soft sand. Service at Stockport was brilliant and bike was perfectly set up on collection
great ride
Size Guide

Additional Product Information
Composition
Frame : 100.0% Aluminum
Design
Entirely designed and developed in France at the B'Twin Village (Lille), this mountain bike is the fruit of the work of an expert team of passionate mountain bikers. Production is done in Suzhou, China by our own factories in order to be as close to the regional Decathlon stores as possible.
Guarantee
Lifetime on frame and fork, 2 years on parts.
Origin
Imported
Warning
California Prop65 WARNING: This product can expose you to chemicals including Lead, which is known by the State of California to cause cancer. For more information, go to www.P65warnings.ca.gov.
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For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.
Decathlon makes the difference
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Research and development
delivers high-quality cost-effective products
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State-of-the-art production processes
minimize manufacturing costs
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Optimized supply chain
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Minimal retail footprint
lowers overhead and indirect costs

Rockrider ST540 Mountain Bike 27.5"
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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.