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MEN SPORT TRAIL MTB BIKE

ROCKRIDER ST 100 Mountain Bike, Grey - 27.5"

ROCKRIDER
4.6/5
User rating
Decathlon
until £179.99 -%

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Ideal for your first foray into mountain-bike riding and regular family outings, the Rockrider ST100 has been designed with comfort as the top priority. Featuring a CGF frame with upright rising position, 21 speeds, 80mm suspension, ErgoFit hammock saddle with Flex seat post and 27.5-inch wheels, it provides control, durability and comfort in equal measure.
  • Light and rust-free alloy frame
  • Grippy tyres and V-brakes
  • Available in different sizes
Not Available Now

We currently have limited capacity to build bikes in our warehouse. Due to this, we are limiting the number of bikes we sell per day and you might not be able to process your order at checkout. The count resets at 11pm every day so that would be the best time to try, although we do have a peak of attempts at this time so we can't guarantee a slot for everyone.

 

Technical Information

WHAT SIZE MOUNTAIN BIKE TO CHOOSE?

Several sizes available:
XS: between 1.40m and 1.54m
S: between 1.55m and 1.64m
M: between 1.65m and 1.74m
L: between 1.75m and 1.84m
XL: between 1.85m and 2.00m
To adapt the bike to your height and size, try these tips:
1/ Sitting on the saddle, you should be able to touch the ground with the tips of your toes.
2/ To find the right saddle height, your knee should be slightly flexed with the foot on the pedal in the lowest position.
3/ If you're between two sizes, choose the larger size.

UNISEX FRAME

With a very marked slope on the top tube and a wide range of sizes (from XS:1.45m to XL:2.00m),
The ST 100 mountain bike frame is UNISEX.
The ST 100 mountain bike exists with the same frame in a WOMEN'S version: adapted seat, narrower handlebars, shorter stem, fork with a more flexible spring, and brake levers that are closer together.
As a WOMAN, if you choose the MEN'S model, we recommend at least purchasing the WOMEN'S SPORT 500 saddle which is adapted to women's body types.

A WORD FROM THE TEAM

We created this ST 100 mountain bike at our B'Twin Village (Lille, France) especially for mountain biking enthusiasts.
Recreational mountain bikers told us they wanted comfort, effectiveness and durability. Those features were our starting point as we designed, developed and tested the ST 100 mountain bike, with real riders involved throughout the project.

A LIGHTWEIGHT, COMFORTABLE, FUN FRAME

It isn't always easy to get the right position on a mountain bike. Our designers have created an entirely new frame that is easy to step over.
The 100% aluminium CGF frame (Comfort Geometry Frame) is both comfortable and easy to handle. The slope angle has been designed to keep your back straighter whilst the rear has been shortened to ensure the bike is very agile when turning.

FRONT SUSPENSION

The 80 mm front suspension helps you overcome your first obstacles on slightly uneven trails with no worries.
Its mechanical spring is a stamp of reliability. And the fork is particularly easy to maintain.
To adjust the stiffness? It's very easy using a single dial.

REAR SUSPENSION: NONE

This mountain bike has no rear suspension.
It is a "hardtail" mountain bike: perfect for beginners launching themselves into their first mountain bike touring rides.
Compared to a full suspension mountain bike (with rear suspension), the advantages are clear: the mountain bike is lighter; you expend less energy on flat ground.

DERAILLEUR & DRIVETRAIN:

3 x 7 speed chainwheels, 21 speeds total!
2 easy-to-use grip shifters on the handlebars.
Left (chainwheels): control ascents/descents.
Right (speeds): more precise control over your pedalling.
In detail:
-Triple-chainwheel chainset (22/32/42 teeth)+ anti-grease protection.
-Microshift FD-M20 front derailleur
-Microshift RD-M25 rear derailleur
-Microshift MS25 grip shifters with speed indicators
-Shimano TZ500 7 cog cassette, 14 to 28 teeth
-Large, solid KMC Z51 chain

HANDLEBARS, STEM, GRIPS

With a stem that tilts 10° upwards, the riding position of the ST 100 is raised, accessible, and comfortable.
In detail:
- 90mm (in sizes XS and S) or 110mm (in sizes M, L and XL) aluminium stem with an angle of 10° for maximum comfort
- 620mm-wide steel handlebar, for stability and control
-"Soft touch" grips for a firm yet soft and pleasant grasp.

SADDLE

The saddle of the ST 100 is welded to prevent any movement of the saddle.
And because your comfort is our next priority after safety, we've added an exclusive wider Ergofit saddle with a hammock shape.
Easily adjust the height of your saddle with the Flex steel seat post, either 350mm or 400mm long (according to the bike size). Its reduced diameter of 27.2mm provides your seat with natural flexibility, 30% more than a standard solution.

V-BRAKES WITH PADS

Two V-Brake pads for effective braking.
These brakes are composed of callipers that exert more or less pressure on the rim to slow or stop the rotation of the wheels.
Thanks to the special design of the ST 100's aluminium brake levers, you only need two fingers to brake.

27.5" WHEELS & TYRES FOR DRY TERRAIN

The wheels of the ST 100 are tolerant and robust, with 27.5" double-walled 28-spoke rims (26" for the XS size). Slow down without worrying about obstacles: small rocks, cracks, holes and bumps!
Because your first rides will be on dry ground, this mountain bike is equipped with DRY 27.5 x 2.0 tyres. Their performance has been optimised thanks to a faster central section, while their side lugs offer excellent traction in turns.

PLATFORM PEDALS

The Rockrider ST 100 mountain bike is supplied with hard resin platform mountain bike pedals for added lightness and safety.
If your foot slides on the pedal, there's less risk of injury.

TRANSPORT & STORAGE

We added a quick release system for easily removing/reattaching the front wheel.
There is a nut at the back to secure the bike and limit the risk of theft. You will need a spanner to remove the rear wheel.
Tip: a bike rack is an easy way to transport your mountain bike without dirtying your car.

ACCESSORIES

Your ST 100 mountain bike comes with a derailleur guard, chainwheel guard (to prevent your clothes from getting dirty), bell, lights, wheel reflectors, and pedals.
The frame is compatible with:
- Front and rear mudguards (Flash MTB or MTB 700)
- Stand (500 Adult Base)
- Bottle cage
- Saddle bag
- Rear pannier rack
- Child seat (depending on the model)
...

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.

LEGAL DISCLAIMER

To ensure components last longer, we recommend a maximum load of 120 kg (rider and MTB included).
To find out more about usage and maintenance information of the SUNTOUR fork, go to the SUNTOUR website.
From there, you will be able to download the instructions manual for your component.
http://www.srsuntour-cycling.com/fr/service/zone-de-telechargement/consumer-downloads/bike/owners-manuals/general-fork-manual/

Weight

XS - 140-154cm: 15.3 kg
S - 155-164cm: 15.4 kg
M - 165-174cm: 15.5 kg
L - 175-184cm: 15.6 kg
XL - 185-200cm: 15.8 kg

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How has this product been built

Composition / advice

Composition
Frame (for bike)
100.00% Aluminium
Stock advice After washing, rub with a dry cloth to remove all traces of moisture. Store your mountain bike in a cool, dry place, away from corrosive products and salty air.
Restricted use : Not suitable for XC, All Mountain, Enduro and BMX.
Legal notice To ensure components last longer, we recommend a maximum load of 120 kg (rider and MTB included).
To find out more about usage and maintenance information of the SUNTOUR fork, go to the SUNTOUR website.
From there, you will be able to download the instructions manual for your component.
http://www.srsuntour-cycling.com/fr/service/zone-de-telechargement/consumer-downloads/bike/owners-manuals/general-fork-manual/

Our commitments

Test Product Our engineers always have real riders test all our products in real conditions. These tests round out our lab tests and let us validate all our products before they hit store shelves.
Guarantee : Lifetime (frame, stem, handlebars). Availability of spare parts: 2 years.
 

Product benefits

Cycling comfort Enjoy touring: raised position, 80 mm suspension, hammock saddle, FLEX seat post
Durability An ultra-strong MTB: double-walled rims, welded saddle, derailleur guard.
Efficiency Light frame, 21 speeds, 27.5" wheels (XS 26"), tyres with low rolling resistance
Directional control Control your steering: V-Brake pads, tyres with side lugs
Lifetime warranty ROCKRIDER offers a lifetime warranty on the frame, handlebar and stem

FAQ

Q : How to assemble your bike?
Everything you need to know about making sure your bike is comfortable, secure and ready to ride.
Q : How do you adjust your brakes?
Having properly functioning brakes is vital when out on the road. Check out how to get them working to your liking.
Q : How to replace a brake lever on a bike?
Having properly functioning brakes is vital when out on the road. Here’s a video to show you how to make sure your new brake level is working nicely.
Q : How to replace a disc brake?
Having issues with your disc brake? Then this video is for you.
Q : How to adjust your bike handlebar?
A suitable handlebar height is essential to your cycling safety and comfort. Find out how to adjust it to your liking with our video.
Q : Do you offer a Cycle To Work scheme?
Find out everything you need to know about way of getting to work that’s good you and the environment.Check Here

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FAQ

Q : How to assemble your bike?
Everything you need to know about making sure your bike is comfortable, secure and ready to ride.
Q : How do you adjust your brakes?
Having properly functioning brakes is vital when out on the road. Check out how to get them working to your liking.
Q : How to replace a brake lever on a bike?
Having properly functioning brakes is vital when out on the road. Here’s a video to show you how to make sure your new brake level is working nicely.
Q : How to replace a disc brake?
Having issues with your disc brake? Then this video is for you.
Q : How to adjust your bike handlebar?
A suitable handlebar height is essential to your cycling safety and comfort. Find out how to adjust it to your liking with our video.
Q : Do you offer a Cycle To Work scheme?
Find out everything you need to know about way of getting to work that’s good you and the environment.Check Here