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ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 520 27.5" Mountain Bike - Women
  • ST 520 27.5" Mountain Bike - Women
ST 540 27.5” Mountain Bike

ROCKRIDER

8500757

ST 540 27.5” Mountain Bike

$660.00
12 reviews
10 of 12 people recommends this product
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 540 27.5” Mountain Bike
  • ST 520 27.5" Mountain Bike - Women
  • ST 520 27.5" Mountain Bike - Women
ST 540 27.5” Mountain Bike
Size :
Not available online

Store Availability

This 27.5" MTB designed for two- to three-hour rides year-round.

BENEFITS

Cycling comfort

Enjoy a raised position, adjustable stem, 100 mm suspension, and hammock saddle.

Directional control

Control your trajectory: hydraulic disc brakes, wide tires, and handlebar.

Efficiency

27.5" wheels, 18 speeds, and light tires for efficiency.

Easy to use

Lock the fork in one quick step and effortlessly adjust the saddle.

Lifetime warranty

Rockrider lifetime warranty on the frame, stem, and handlebar.

Instructions


TECHNICAL INFORMATIONS

What size mountain bike should I choose?

Several sizes available:

S: between 1.50 m and 1.64 m
M: between 1.65 m and 1.74 m
L: between 1.75 m and 1.84 m
XL: between 1.85 m and 2.00 m

If you are between 2 sizes:
Choose the smaller size for easier steering (easier handling) and comfort (straighter back).
Choose the larger size for easier pedalling with a more stretched-out position (position more suited to performance).

Unisex frame

With a heavily-sloped top tube and a wide range of sizes (from S: 1.50 m to XL: 2.00 m).

The ST 540 mountain bike frame is unisex.

The ST 540 mountain bike available with the same frame in a women's version: adapted seat, narrower handlebar, shorter stem, fork with a more flexible spring, and brake levers that are closer together.

If you’re a woman choosing the men’s model, we recommend purchasing the women’s Sport 500 saddle, which is adapted to women's bodies.

A word from the team

The ST 540 mountain bike was designed and developed by our passionate MTB team at the B'Twin Village in France (Lille).
A comfortable, efficient mountain bike: more progressive, powerful hydraulic disc brakes, 100 mm travel in the fork to ride easily over obstacles, and simple and effective double chainring, ...
MTBers have been involved at every stage of this bike's development process.

A comfortable, playful frame

For less weight and more efficient pedalling, the Rockrider ST 540 MTB frame is made from 6061 aluminum (only 2.1 kg in size M).
Created for comfort and easy handling. Its slope has been designed to keep your back straighter. The lower bottom bracket boosts stability during turns.

100 mm front suspension

Ride over obstacles with the hydraulic fork. Its 100 mm travel allows you to overcome more obstacles (roots, pebbles, stones, mud).

Its built-in lockout system helps prevent bobbing and deceleration on faster terrain.

Rear suspension: none

This mountain bike has no rear suspension. This is a "semi-rigid" mountain bike.
Compared to a full-suspension mountain bike (with rear suspension), the advantages are clear: this mountain bike is lighter and less energy is lost on level ground. If comfort and manoeuvrability are a priority, the ST 540 with full suspension is available.

Double chainwheel derailleur and drivetrain

2 9-speed chainwheels for 18 easy-to-use speeds.
The thru-axle bottom bracket is very stiff and long-lasting.

In detail:
-Shimano Altus 22 and 36 tooth double chain
-Microshift FD-M462 front derailleur
-Shimano Altus rear derailleur
-Shimano Acera shifter with speed indicators
-Microshift H092 9-cog 11 to 36 tooth cassette
-KMC X9 chain

Handlebar, stem, and grips:

The adjustable stem puts the ST 540 controls in your hands. The all-aluminum Rockrider stem is 70 mm (size S), 80 mm (size M/L), or 90 mm (size XL), and can be raised to five adjustment intervals: + 0 mm, + 7.5 mm, + 15 mm, + 22.5 mm, + 30 mm.
In detail:
- 720 mm oversize Rockrider Sport aluminum handlebar
- Rockrider Sport "soft touch" ergonomic grip for good traction and a comfortable feel.

Saddle:

Our teams designed and created an exclusive Rockrider Ergofit Evo saddle. Designed for all hip widths, hammock-shaped for comfort on long, athletic rides. The Flex 27.2 mm diameter aluminum seatpost adds comfort.

Use the adjustment lever on the seat post clamp to quickly and easily adjust the saddle height without tools.

Hydraulic disc brakes

Whatever the weather, dry or wet, Rockrider by Tektro 160 mm double hydraulic disc brakes will come through, even in the mud.
Hydraulic braking increases power and progressive braking, requiring less reliance on the brake levers.
The aluminum brake levers are easy to grip, lightweight, and precise.

27.5" wheel with double-walled rims and all-condition tires

The aluminum wheels are effective and sturdy: 27.5" diameter and double-walled rims. Their diameter is the perfect balance between comfort and performance. With 28 spokes, they are lightweight, stiff, and durable.

The exclusive Rockride All Conditions Light 27.5 x 2.1 60 TPI wide tires have side knobs designed for all-terrain riding (dry, wet, etc.).
Tubeless Ready 23 mm rims: rim tape, Schrader valves, and puncture sealant not included.

Platform pedals:

The ST 540 comes with Rockrider Flat platform pedals with a wider pedalling surface and more pronounced dots for better grip on the pedal.

Easily transport and store your mountain bike

A quick-release system added for easily removing/reattaching the front wheel.
Our advice: a bike rack is an easy way to transport your mountain bike without getting your car dirty.

Accessories:

Your ST 540 mountain bike is fitted with a bell, lights, wheel reflectors, and pedals.

The frame is compatible with:
- Front and rear mudguards
- Stand
- Bottle cage
- Saddle bag
- Rear pannier rack
- Child seat
etc.

Comfort and safety

Your bike's components (chain, derailleur, brakes, etc.) will adjust over time. Take advantage of a free servicing within 6 months after purchase. Our technicians will carry out a 13-point check of your bike. Just come to your nearest Decathlon workshop with your Decathlon card and/or receipt.

Legal disclaimer

To make components last longer, we recommend a maximum load of 120 kg (rider and MTB included).

Reviews

4.4/5 12 reviews
10 of 12 people recommends this product
bin shedding this bike for 3 days and it'sa dream
kevin (Canada) Used for 2 week or less Verified purchase What is a "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 a review is not marked as "Verified purchase," this does not mean that the author's review has no experience with the product. They may have given their review directly on the site without unique identification, or the product has been offered or paid by someone else.

The label "Verified purchase" let's help you judge the reliability of a review.
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 me
Shayaan (United Kingdom) Used for 4 to 6 months
I have had this bike for just over 3 months and I love it. I use it everyday and have upgraded from my previous rock rider that I had used for 3 years. Rock rider is a reliable brand and this bike is a great representation of the brand’s great quality at a realistic price. I use this bike everyday to get to school and it works really well in all weather conditions.
I would definitely recommend this bike as it is awesome and you will definitely get your money out of it.
Great Bike
Stuart (United Kingdom) Used for 3 to 8 weeks
I've had this bike for about a month now and I love it. Excellent value for money, I have ridden it on a real mix of terrain and it handles really well on everything so far, very pleased with it.
Used to be great
Sam (United Kingdom) Used for More than 1 year
I've had this bike for a little over a year now, and aside from an upgraded stem and bars, i have kept everything stock. I took it in for one service, where the mechanic failed to spot a basic issue with how my gears were indexed, was unable to fix it, prompting me to spend more money at a local bike shop. About 3 weeks ago (almost one year to the day) the whole bike began to fall apart. When it was taken to said local shop, i needed a new bottom bracket, new breaks, and whole new gearset. The cost of all these repairs is basically as much as i had to pay for the bike. before this, it had been really enjoyable to ride, but now im looking at just buying a whole new bike, off a competent brand, and moving past this whole ordeal
Rockrider st540
Daryl (United Kingdom) Used for 3 to 8 weeks
Good bike for the value of money. Gears are a little bit clunky and noisy. But, Its a great looking bike and the front suspension forks are good. So far, the tires seem durable and the bike is light to carry. Ive had fun riding this bike overall and the wide handlebars are ideal for me.
Artur
Artur (United Kingdom) Used for 2 week or less
Great bike!! Worth it! A big thank you!! to Mick from Sheffield Store.
Great bike
Richard (United Kingdom) Used for 8 to 12 months
Had it 7 months now, no point reviewing too soon. Came from a giant revel, canot beleive how much more fun this is, light, responsive with really good equipment. Highly recommend especially for the price,
David
David (United Kingdom) Used for 3 to 8 weeks Verified purchase What is a "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 a review is not marked as "Verified purchase," this does not mean that the author's review has no experience with the product. They may have given their review directly on the site without unique identification, or the product has been offered or paid by someone else.

The label "Verified purchase" let's help you judge the reliability of a review.
Good road bike
Cool bike
Markov (United Kingdom)
When they drive to Russia
Not great
Scott (United Kingdom) Used for More than 1 year
Had it for a couple years and the forks go solid after 30-40 mins of riding and the lockout and adjustables on the forks don’t change a thing. The brakes also need bled constantly and aren’t great
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