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This 27.5" mountain bike has been designed and developed to best suit getting started with mountain-bike touring in dry weather, for rides of up to 90 minutes.

The bike has a raised position, comfortable saddle, 27.5" wheels (26" in the XS size), double-wall rims and a light aluminium frame. The mountain bike and its features ensure a comfortable ride.

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Sale price: Dhs. 1,475.00

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Product Features

A photo of the 27.5 Inch WOMEN'S MOUNTAIN BIKE ROCKRIDER 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 and welded saddle


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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2030 reviews

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Mountain Bike

Just as good as the leading brands, bought this as we found the V-brakes easier and cheaper to maintain.

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BTwin Rock Riders and 920 AF Road bike.

Third purchase of a bike from Decathalon. They are very good quality and excellent value for money. Great service from the staff at Portsmouth and Southampton stores.

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Great item

Lovely bicycle very comfortable

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Great bike & service

The guys were great, very efficient in getting the bike ready to take home after purchasing.

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White pink ROCKRIDER.

great for a brand new entry level bike. The wife likes it.

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Bike review

Great bike for my daughter well made she is over the moon with the bike.if your looking for negatives it is on the heavy side but can’t fault it for what you are paying yes I would recommend.

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Bike Girls bike

Funky bike love the colours Very light x Gift for out daughters 10th birthday x

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so far so good

I do love my new bike, putting it together was easy enough and its nice and light for me.


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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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.

Photos non binding

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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