Product Colors and Sizes

  • Black Friday product
  • New Deal product
  • Cyber Monday product
  • Clearance product
  • Deal product
  • Best Seller product
  • Ecodesign product
  • New product
  • Staff Pick product
  • In The News product
  • Innovation product
  • product

Rockrider ST540 Mountain Bike 27.5"

Sale price: $350.00 Regular price: $699.00

Mid-level Sport Trail mountain bike hardtail

Color: Select a color
Size: Select a size
Size Guide
Sale price: $350.00 Regular price: $699.00

See shipping rate at checkout

Final Sale: No returns or exchanges

Free returns

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.
Model: 8629914

Product Features

A photo of the Rockrider ST540 Mountain Bike 27.5" in use
A photo of the Rockrider ST540 Mountain Bike 27.5" in use

Rockrider ST540 Mountain Bike 27.5" | Sport Trail mountain biking

Mid-level Sport Trail mountain bike hardtail

Cycling comfort

100 mm hydraulic fork (smoother). Ergonomic saddle. Height-adjustable stem.


Shimano 2×9 speeds. Lightweight, fast tires. Fork with lockout.

Easy to use

2×9 speeds, hydraulic disc brakes, suspension fork

Questions & Answers

Product Customer Reviews

Skip to reviews
2520 Reviews
Write a Review 
Rockrider ST540 Mountain Bike 27.5
Filtered by reviews Loading reviews…
ST540 very fun

Very fun and smooth ride

icon-circle-checkmark verified purchase
Beyond expectations

The bike is truly wonderful, it arrived very quickly, and the staff in the Rozzano bike department proved to be courteous, attentive and professional. The bike was delivered to me perfectly assembled and fully adjusted properly. I thank all the guys at Decathlon Rozzano for their availability.

icon-circle-checkmark verified purchase
in the top

in the top

Rockrider ST 540

The bike is very good, it is very light and it is perfect for MTB - DOWNHILL

Bicycle Worth Attention

Good bike, nice equipment configuration at an affordable price 👍

icon-circle-checkmark verified purchase
For this money it's really worth it

The bike served me for over 2 years and I was very pleased with it until the frame suddenly broke. A visit to Decathlon and a cash refund, the bike was taken away. Topic solved with 5+.

Good product !

Good product !

icon-circle-checkmark verified purchase
Very good bike

2 years of use approximately 3500 km traveled (35 - 40 km per week) Delivery to store very good reception easy to recover Hydraulic brakes no wear or leaks (they brake as on the first day) Mechanical no problem Value for money correct Maintain it regularly (lubricate the chain 3-4 times a year - check tire pressure once a month) and store it in a dry place. In short, I highly recommend this very practical bike for everyday use (even in rainy weather)

Great bike, very nice…

Great bike, very nice and comfortable

icon-circle-checkmark verified purchase
Use of the Article for 2 years

I've had this item for two years and use it for city mountain biking and light mixed circuit tours. Regarding Decathlon Assistance, I am positively surprised by the team at the Decathlon da Maia workshop who have been able to solve all the problems that have arisen. In this period only one broken spoke is reported. And in a fall I had to replace discs and a spoke. The bike has good quality components, however it leaves a little to be desired when it comes to the frame as it should come with a frame with a tapered steering gear, allowing for a future suspension upgrade. Otherwise, the strengths of the equipment in my opinion are: -the fact that it has a complete Shimano Altus group, with the exception of the cassette, which has good quality and durability in general; However, a rear derailleur with clutch would be an excellent upgrade; - The brakes, despite being basic, have good mechanical performance; - The wheels, despite not being very light, have a good overall quality

Good bike, unbeatable price-quality ratio

A good bike for this money should be easily adjusted and centered because it jumps some gears but otherwise it does its job brilliantly. I recommend it to everyone who does not want to invest and walk on forest roads and slightly rough terrain. A plus is the presence of Hollowtech at this price. Good pedaling and fun as much as possible.

icon-circle-checkmark verified purchase
After 2 years

Use: Pyrenean piemond sports hike from 200 to 1200m of elevation gain / outing. I also use it for my daily trail and road trips where the st 540 is surprisingly effective in locking out the fork and very inflated. It's my first mountain bike, I've been using it for almost 2 years and I'm having a lot of fun with it, I've been able to make good progress. A few downsides: -leakage of the fork and I have to bring it back to the workshop a second time because the fork returns badly to the "high" position. -I had a problem from the purchase of systematic "chainstuck" that the workshop temporarily settled by changing the crankset, this problem comes back little by little as soon as the ground is muddy or when I ford a stream by example. However, I try to clean and maintain the transmission as much as possible. -I punctured once or twice per ride before changing the original inner tubes for anti-punctures. I find the inflation system of the latter (presta) inconvenient and ended up blocking preventing inflation. Maybe I'll go tubeless one day. -During slightly rough descents, I often reach the end of the fork's travel (100mm), nothing too bad for my level, but maybe it will be interesting to change it in the future. That said, it's a good bike, efficient on the climbs and fairly precise on the descents (wide handlebars). I really like the double chainring which in intermediate gear allows you to quickly go from small to large chainring to have torque on climbs and relaunch on descents when the trails are a roller coaster.

icon-circle-checkmark verified purchase
MTB 540 V2 disposable

Hello, I acquired a 540 V2 single chainring 10 speed mountain bike in June 2023. After 2 hours of mountain biking, the gears jump. Diagnosis at the workshop: rear wheel hub out of service. The bike was immobilized for 3 weeks. Rear wheel change by after-sales service. After a week of urban use in July, the rear of the saddle cracked and the left pedal broke. I order parts from an online bicycle store in Paris. Unfortunately at the beginning of August the left pedal was torn from the crank. Workshop diagnosis the crankset needs to be changed. August 21 again the gears (large sprocket) jumping. After careful adjustment and a visit to the workshop. The rear wheel changed because too much oscillation of the casette which causes a cracking and a chain jump. As a result, my 50 kg son did 2 hours of mountain biking and around 15 afternoons of urban riding during the summer period. I have taken the bike to the workshop 3 times and I am skeptical about the quality and durability of the entire transmission. For your information, he used my old 26'' for 2 years and no problems of this order. The mountain bike should be orange and of the famous razor brand. Many thanks to the people who take the patience to provide maintenance for customers.

Left pedal released - Impossible to put it back on

Since purchasing this bike, it has been used at most ten times. However, yesterday, during a walk without any particular difficulty, the left pedal started to make noise, then simply came off. However, I had checked the bike before leaving and nothing suggested this problem. But in addition to having to walk home, it is impossible for me to get back on the pedal! Looking at the comments, I see that this problem is recurring on this model, several buyers having already reported it. But as my bike was purchased at the end of January 2019, it is no longer under warranty. I hope given the circumstances (bike which has really been ridden very little and defect known to Decathlon) that a commercial gesture will be made by the after-sales service for the repair. For the moment, despite the pleasure of the product, I can only give a downgrade given the fragility.

Good bike

I bought the bike used 3 years ago. Since then, I have driven it over 1000 km on asphalt and gravel, but also on singletracks in Kaczawy, the Karkonosze Mountains, the Sudetes... in conditions for which it was neither designed nor intended. It has never let me down, I have never had a breakdown. I replaced the saddle with a more comfortable one for long rides. I'm just replacing the headset for the next user ;) A perfect bike to start your Trail/Enduro adventure, and I would like to remind those who complain that the bike needs to be serviced regularly.
Skip to reviews

Size Guide

Size Guide Visual

Additional Product Information


Frame : 100.0% Aluminum


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.


Lifetime on frame and fork, 2 years on parts.




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

Superior quality. Unbeatable prices.

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
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual

Please Sign In to Post Your Question

In order to notify you about the answer it is required to Sign In.

Sign In