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Women's 27.5" Mountain Bike ST 100 - White/Pink

Sale price: 106.000 KD Regular price:
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Size: Select a size
Sale price: 106.000 KD Regular price:
Model: 8405317

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Product Features

Women's 27.5" Mountain Bike ST 100 - White/Pink : Our team designed this 27.5" mountain bike especially for women getting started with mountain biking, for rides of up to 90 minutes in dry weather.

Comfort first and foremost: this ST100 women's MTB has a raised position, comfortable saddle, 27.5'' wheels (26" / XS) to keep you comfy while mountain biking. Double-wall rims and light alu frame.

A photo of the Women's 27.5" Mountain Bike ST 100 - White/Pink in use

Cycling comfort

Enjoy touring: raised position, 80 mm suspension, hammock saddle, FLEX seat post


An ultra-strong MTB: double-walled rims, welded saddle, derailleur guard.


Fly with a light frame, 21 speeds, 27.5" (XS 26") wheels & fast rolling tyres.

User comfort

Comfort for women: ergonomic saddle and fork adjustable starting at 45kg.

Ease of use

Adjust your weight on the fork, starting at 40kg.

Lifetime warranty

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

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Product Reviews

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1344 reviews

Women's 27.5
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Excellent product gone are the days of having to build it yourself

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Ladies bike

Very nice bike, comfortable to ride esp with a child bike seat attached to the back. Only 1 thing was the seat isn't that comfortable so I bought a gel saddle cover and it has made all the diffrence.

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Great quality bike

We bought this for our daughter, she's only 9 yrs old but 146 cm tall. We didn't want a kid's bike for her as they tend to be very heavy with poor quality components. This bike is perfect for her now, easily rideable with plenty of saddle adjustment for a growing kid. The bike came quickly and was well packaged as you would expect. Assembly took about 5 minutes, just fit the pedals and handlebars. Tools provided are adequate for this. The fit and finish of the frame and components is superb for a bike in this price range, gears change precisely and easily, brakes work well enough and the front suspension is adjustable for rider weight. Tyres are chunky and were already inflated out of the box. If you are looking for a bike for a teen or small woman then this could be for you too. My daughter is delighted with her new bike and should get years of use out of it

good looking bike but do you get value for money?

A good looking bike but the breaks are rubbish ( particularly when wet) and can be dangerous. I suppose you get what you pay for. My bike got stolen and I am not getting the same one.

Decent bike for the price!

I would definitely recommend this bike. It is really quite lightweight and, for the price, is excellent.

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Wifes 1st bike

She loves it....well made,just 100% exactly what she wanted. Great price

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Rock rider

Nice looking bike and great value for money

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Great VFM, let down by lack of saddle adjustment

Mechanically this is a great bike. Perfect for leisure riding, and quite well assembled in the box it comes in. However, the contact points are the most important part of a bike. That's the pedals, seat and bars. On the ST100 the saddle has no, or little adjustment for tilt. I ended up buying a new seatpost for my daughter as she was incredibly uncomfortable after only a short ride. As a bike builder and avid cycling enthusiast I was able to figure out why, the saddle was nose up! Generally a level, or slightly nose down seat is more comfortable. I'd still recommend this bike, I bought it because it fitted the purpose better than any other option, just budget for an adjustable seatpost, its a fairly standard size so easy enough to get hold of.

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For my daughter

A superb bike and a fantastic price!

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St 100

Good bike apart from the tyres. I have only been on two bike rides so far and both times I have had a puncher

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st 100 women's 27.5" mountain bike

great size bike for my daughter, the assistant advised us to get this size as it has bigger wheels and would last he a lot longer, great bike for the money, also came with lights and bell, we bought a water bottle and carrier that the assistant fitted when he was doing his pre deliver check.very helpful staff the bike also comes with a free service.

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Heavy but durable

The twist grip gears are too hard for my daughter to turn in the direction against the spring. Levers instead of twist grip would be preferred. Good bike for the price

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Daughters gift

Bought for my daughter and she loves its perfect

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Great bike and great value service was brilliant

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Great bike

The bike is great. Missing parts from decathlon. I had to purchase the quick release skewer to attach the front wheel as it was missing, also the band is missing to attach the rear tail light. Except the missing parts. The bike is great. You might also consider a saddle cushion to avoid the soreness. 5 starts for the bike , 3 stars for decathlon for missing the assembly items.

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Additional Product informations



  • 100% Aluminium

Which is the right size?

Here is our guide for MTB sizes.XS:between 1.40m and 1.54mS: between 1.55m and 1.64mM: between 1.65 m and 1.74 m / 15.5 kg in size ML: between 1.75m and 1.84mTo fit your MTB to your 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 adjust the 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 smaller size.

The women's rockrider mtb project

Designed and developed entirely in France at the B'Twin Village (Lille).The team observed and studied women's needs and used this to design and test the ST 100 MTB, involving mountain bikers at every stage of the process.Our aim is to make you want to jump onto your comfortable, easy-to-use mountain bike so that you enjoy every one of your rides.

A mountain bike for girls and women

We carried out studies:These included studies with the Decathlon Sports Lab, and real-world tests with hard-core women mountain bikers.The result: a bike with positioning elements designed for women!These include:- A comfortable saddle with a hollow centre that is adapted to wider hips.- An adjustable fork based on your weight starting at 45kg.- An XS frame starting at 1.40m

A comfortable, playful frame

Because we've noticed that it's not always easy to get the right position on a mountain bike, our designers have created an entirely new frame that's easy to get onto.The CGF frame (Comfort Geometry Frame) is 100% aluminium for optimal comfort and excellent manoeuvrability. The slope angle has been designed to keep your back straight, while the low rear ensures the bike is very agile in turns.

Front suspension for cushioning lumps and bumps

Adjust the suspension hardness based on your weight, from 45 to 90 kg, to get over roots and stones more easily.All thanks to the UFIT concept (exclusive to Decathlon). Easy: simply turn the adjustment wheel!The 80 mm front suspension is designed for slightly uneven trails and helps you overcome obstacles with peace of mind.Its design, based on a mechanical spring, is reliable and easy to maintain.

Derailleur & drivetrain: how to change speeds

3 x 7 speed chainrings, 21 speeds total!2 easy-to-use grip shifters on the handlebar.Left (chainrings): control ascents/descents.Right (speeds): more precise control over your pedalling.In detail:-Triple-chainring chainset (22/32/42 teeth) + protection / grease.-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

Stem, handlebar, grips: for comfort

The 90mm long aluminium stem, with a 10° angle, provides maximum comfort!- The 620mm-wide steel handlebar provides stability and control.- The soft touch handles are comfortable to hold and provide good grip.

V-brakes: brake effectively!

The 2 V-brakes are made of 2 callipers that exert pressure on the rim to slow or stop the rotation of the wheels.The brakes can be applied using only two fingers.One a year, check how the pads are wearing. If the grooves are disappearing, take your bike to your local store's workshop.We offer a free inspection of your mountain bike within 6 months following the purchase of your bike.

27.5" wheels & tyres for dry ground: ready to ride?

Take on your first obstacles! The wheels are effective and sturdy: 27.5", double-walled rims, 28 spokes (26", single-walled and 32 spokes in XS). The rim is lined for added durability and shock absorption. The DRY 27.5 x 2.0 tyres offer optimal performance with a rolling central part and knobs on the side to grip the ground on corners.

Platform pedals

The Rockrider ST100 mountain bike comes with resin platform mountain bike pedals for added light weight and safety. If your foot slips off the pedal, there's less risk of bruising your shin.

Easily transport and store your mountain bike

Not all rides start on your doorstep.Need to remove the front wheel?It's easy thanks to the clamping lever built into the wheel.And the rear wheel?There is a nut at the back wheel to secure the bike and reduce the risk of theft.Note that a flat spanner is needed to remove the rear wheel. For safe rides, don't forget to bring anti-puncture spray.To keep your car clean, a bike rack can make your life easier.


Your ST 100 mountain bike comes with a chainwheel guard (to protect your clothing from dirt), bell, lights, wheel reflectors and pedals.The frame is compatible with:-500 chainstay stand (ref. 8302792)-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)-500 pannier rack (ref. 8364376)-POLISPORT GROOVY frame-mounted baby seat (ref.8385622), from size S

Comfort & safety

The saddle of the ST 100 is welded to prevent any movement of the saddle.We recommend that beginners wear cropped bottoms or cycling shorts with a pad (foam in the shape of a saddle) or a gel saddle cover to reduce soreness. For long rides, it's always a good idea to take a drink with you (e.g. a hydration bladder or bottle) and a helmet.

An easy-to-understand mtb with stickers

Did you notice the coloured stickers over your mountain bike?Don't worry, it's not to add a touch of colour.Resistant to wear, they provide hints on how to adjust your bike:-adjusting the fork-tyre pressure-rim diameter-saddle heightWhen you head out on a ride, it's useful to have the manual directly on your mountain bike!For other information (washing, chain maintenance, etc.), please refer to our bike care guide.

Item may differ from photograph

As for the 7 cog cassette with 14 to 28 teeth, the photos or videos on the description of the bike show a SHIMANO TZ500 cassette. However, due to supply difficulties, the bike can be equipped with an equivalent WHEELTOP cassette .

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