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27.5" Full Suspension Mountain Bike ST 540 S - Blue/Orange

Sale price: 287.000 KD Regular price:
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Sale price: 287.000 KD Regular price:
Model: 8500761

Product Features

A photo of the 27.5" Full Suspension Mountain Bike ST 540 S - Blue/Orange in use

27.5" Full Suspension Mountain Bike ST 540 S - Blue/Orange : This 27.5" MTB is designed for MTB rides lasting 2 to 3 hours, all year round.

Control your trajectory even better with the fully suspended ST 540 S. 120mm fork, air shock, hydraulic brakes, and 27.5" double-walled wheels for guaranteed comfort with a sporty ride!

Cycling comfort

Enjoy the raised position, adjustable stem, 120mm suspension and hammock saddle

Directional control

Control your trajectory: hydraulic fork and brakes, tyres and a wide handlebar.


Ride efficiently thanks to 27.5" wheels, 18 speeds and light tyres.

Ease of use

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

Lifetime warranty

ROCKRIDER offers a lifetime warranty on the frame, handlebars and stem.

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Product Reviews

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317 reviews

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Good purchase

Honestly i think this is the best bike btwin have created i got it nearly a year ago now at the start of lockdown and trust me when i say its been used i have escaped the people who you usually stop for and other people who im not going to mention on this bike you gain speed really fast you notice this when you are going up or down a hill your moving much faster than everyone else unintentionally you literally dont have to peddle down a hill and you will be moving faster than everyone else and i like the suspension lock feature on the front forks this helps you gain even more speed I honestly feel like a rally driver on this bike i have given frontys backies “3 man deep” i have even had 4 people on the bike whilst im peddling if you think im lying please get in contact with me *realised you cant so sorry i will prove that this is true i have road to salford quays numerous times an ive gone to winter hill which is all cobble stone and i flew down it effortlessly honestly a stunning bit of gear i highly reccomend if you have an active lifestyle and if you ride your bike alot the contraption that changes the gears on the front is made perfectly as the thing that contacts the chain is metal and the thing that moves that is plastic if you have owned a bike and you havent cleaned it for awhile you know that if it was metal it would rust and you would have issues changing the gears but because it’s plastic it changes gear perfectly and instantly ive been niced by decathlon every bike you purchase should be from here and if it isnt your deluded and getting scammed i feel like they lost money selling this bike its amazing what it does it drives you truly a good bit of kit dont even hesitate because if your looking at the reviews i know ur thinking of getting it just buy it honestly theres not a point where this bike doesnt meet your needs

Good bike

I received my bike 2 days later than the date agreed at checkout and the stupid courier just walked in my house and put the bike in the hall without asking to come in. Very disappointing as this was during the lock down in April. The box was in a horrendous state but thankfully no damage to bike apart from to the paintwork on the forks. No instructions provided for bike or components (fork/shock etc...), missing reflectors on back wheel and the lights supplied have no fittings so useless. Why still 4 stars? The bike was built and tested so no issues and could ride as soon as attached handlebars/pedals. The bike is light and feels nice to ride on and the rear shock is excellent for a bike in this price range, the front forks are the weakest component on the bike but I expected this - The front fork has a maximum compression of 90mm so the 120mm advertised is 100% false. Having said that the front fork is still ok for the use it's intended for but I will be replacing it as soon as possible. Fork has no branding but I presume it must be made by SR SUNTOUR. As pictured the fork has a reverse arch. Also the front fork has no warning/intended use sticker and has started making a clicking sound.

Great spec

Only had the bike a few days, but I’m impressed with the quality of the build and the ride. It’s quick steering and incredibly light and agile. Friends with bikes three times the cost of this are impressed with its build quality and components- one with a Calibre even reckons the paint finish is way better than many others. Will be changing the bar grips for some with a little more padding, buts that’s all I’d change. Excellent product.


Hi I have order this bike BUT received with number of scratches all overt the frame and missing parts including Handle bar screws are missing. Technically can’t ride the bike until I fix it. I have contacted customer service and they have kindly offer £20 gift voucher and I need to go and buy missing screw myself. I have spent £500 on this bike and this is what I got! If you are serious buyer; Please DO NOT try this unprofessional people. Sorry I can’t review the bike because I have to fix it first. Hopeless


Gracias Marc por la buena atención recibida.


...a krásná cena !

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Lehke, stabilni, dobra geometrie a odpruzeni

Odpruzeni, brzdy, kola a celkove geometrie kola velikosti L padne do ruky na mou velikost. Prijemny a jisty posez. Do kopce nehoupe. Prekvapeny z rychlosti prevodu 36/11 kdy neni problem jet na 40. Na predku pouzivam pouze vetsi 36 rozetu a vzadu 5 kolecek od nejrychlejsiho nahoru a vyjedu vsechno. Mensi rozeta v predu je mozna zbytecna a usetril bych o jednu packu/rozetu mozna nejakych 30-40 dkg. Vaha nizka.

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naprosto skvělé kolo, bezkonkurenční cena/výkon

Dcerka je naprosto spokojená, kolo naprosto splňuje požadavky. Cena/výkon je bez konkurence, dobře osazeno, všechno robustní a přitom v dobré váhové normě. Již druhé kolo v nasi domácnosti a naprosto bez poruch a závad. Jen běžná údržba.

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Tolles Bike für den Sohnemann.Bis jetzt kann man wirklich nichts schlechtes sagen, alles

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Preis Leistung sehr gut

Sehr gutes Fahrrad

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Sehr zufrieden

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Super zufrieden würde es immer wieder kaufen

Genauso habe ich mir mein neues Rad gewünscht. Super leicht die Gänge sind super und es ist klasse für downhill



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Keine Beschwerde, Probleme

Ich fahre das Fahrrad seit dem 8.Mai fast täglich es ist bis jetzt noch nichts kaputt gegangen. Das einzigste indem man meckern könnte wären die Bremsbeläge, aber ansonsten keine Probleme.

Schlechte Verarbeitung

Ich besitze das Fahrrad seit dem 1. Februar und habe es sehr gepflegt aber die Qualität von den Anbau Teilen ist für diesen Preis nicht genug. 2 Freunde von mir haben das selbe Produkt und bei ihnen ist es genau so.

Hallo Jens,

vielen Dank, dass du dir Zeit genommen hast, um deine Erfahrungen mit uns zum Mountainbike ST540 S von Rockrider zu teilen. 

Es ist natürlich sehr ärgerlich, dass du nicht zufrieden bist mit der Qualität, dies werden wir selbstverständlich weitergeben.

Solltest du weitere Fragen haben, steht dir unser Serviceteam (service[at] jederzeit zur Verfügung.

mit sportlichen Grüßen



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Additional Product informations



  • 100% Aluminium 6061

Which is the right size?

Several sizes available:M: between 1.65m and 1.74mL: between 1.75m and 1.84mXL: between 1.85 m and 2.00 mIf you are between 2 sizes:Choose the smaller size for easier steering (easier to handle) and comfort (straighter back).Choose the larger size for easier pedalling with a more stretched-out position (position more suited to performance).

Unisex frame

The ST 540 S MTB has a UNISEX frame.The ST 540's frame has been carefully designed down to the smallest detail, from the top tube's relatively pronounced slope, to the wide range of sizes (M: 1.65m to XL: 2m). The ST 540 S is not only lightweight and comfortable, but UNISEX as well.To make the most of the improved comfort, the women on the Rockrider team recommend the 500 Women's Sports saddle, which is specially designed for the female form.

A word from the team

The ST 540 S mountain bike was fully designed and developed by our passionate MTB team at the B'Twin Village in France (Lille).A comfortable, efficient mountain bike: more progressive and powerful hydraulic disc brakes, air shock and 120mm fork to get over obstacles easily, simple and effective double chainring.Women mountain bikers 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 S frame is made from 6061 aluminium (only 2.7 kg in size M without suspension). Its 120mm rear shock uses a single-pivot system (more sensitive to small impacts, while remaining firm when encountering large impacts) and sealed bearings for a great lifespan.

120 mm front suspension

The hydraulic fork with 120 mm travel allows you to easily ride over more obstacles (roots, pebbles, stones, mud).Steer a precise path with the higher diameter dampers (32 mm).The fork's built-in lockout system helps to prevent bobbing and loss of speed on faster terrain.

Rear air suspension

This bike has a light 120 mm X-FUSION E1 air shock that has been specially adapted to fit this frame. You can easily adjust it based on your weight using the Schrader valve, providing you with a very good balance of sensitivity and performance.A special "high pressure" pump is required to adjust this shock (Rockrider fork and shock pump - ref: 3310286).

Double chainring 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 chainring-MICROSHIFT FD-M462 front derailleur-SHIMANO Altus rear derailleur-SHIMANO Acera shifters with speed indicators-MICROSHIFT H092 9-cog 11 to 36 tooth cassette-KMC X9 chain

Handlebars, stem, grips

The adjustable stem brings the ST 540 S controls to your hands. The all-aluminium Rockrider stem is 80 mm (size M/L), or 90 mm (size XL) and can be raised to 5 adjustment intervals: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm.In detail:- 720mm oversize ROCKRIDER SPORT aluminium handlebar- ROCKRIDER ergonomic grips for good grip and a comfortable feel.


Our teams designed and created an exclusive ROCKRIDER ERGOFIT Evo saddle. Designed for all hip widths, its hammock shape is very comfortable for long, athletic rides. The aluminium Rockrider Sport seat post is lightweight and has a wide adjustment range, with a 31.6 mm diameter and 400 mm in length.Quick and easy tool-free adjustment of your saddle height using the adjustment lever on the seat post clamp.

Hydraulic disc brakes

No matter what conditions you ride in (dry/wet), the Rockrider by Tektro 160mm double hydraulic disc brakes will come through for you, even in the mud.Hydraulic braking adds more power and progressive braking and requires less powerful use of the brake levers.The aluminium brake levers are easy to grip and precise.

27.5" wheels with double-walled rims and all-condition tyres

The aluminium wheels are effective and sturdy: 27.5" diameter and double-walled rims. Their diameter is the perfect balance of comfort and performance. With their 28 spokes, they are lightweight, stiff, and durable.The wide, ROCKRIDER ALL CONDITIONS (60 TPI) 27.5" x 2.1 tyres have side knobs designed for riding on all types of terrain (dry, wet, etc.).Tubeless Ready 23 mm rims: SCHRADER valves, TUBELESS rim tape, TUBELESS tyres, and puncture-proof liquid to be added.

Platform pedals

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

Easily transport and store your mountain bike

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


Your ST 540 S mountain bike comes with a bell, lights, wheel reflectors and pedals.The frame is compatible with:-100 bottle cage (ref. 8049106) and 500 bottle cage (ref. 8358133)-Mountain bike mudguard set (ref. 8385291)-100 saddle bag (ref. 8347394) and 500 saddle bag (ref. 8354448)

Comfort & safety

Your bike's fittings (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.

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