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.
DERAILLEUR and DRIVETRAIN
3 x 7 speed chainrings, 21 speeds total!
2 easy-to-use grip shifters on the handlebars.
Left (chainrings): control ascents/descents.
Right (speeds): more precise control over your pedalling.
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.
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.
Just two fingers are all you need to brake.
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 TERRAIN: Ready to roll?
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.
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.
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.
Your ST 100 mountain bike comes with a chainring 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
WHAT SIZE MOUNTAIN BIKE TO CHOOSE?
Here is our guide for MTB sizes.
XS: between 1.40m and 1.54m
S: between 1.55m and 1.64m
M: between 1.65 m and 1.74 m / 15.5 kg in size M
L: between 1.75m and 1.84m
To 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.
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 .
Tips for storage and maintenance
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.
Restrictions on use
Not suitable for XC, All Mountain, Enduro and BMX.
TESTS AND WARRANTY
Our team did real-world tests in the field to test our bikes with women mountain bikers. These tests round out our lab tests and let us validate all our products before they hit store shelves.
Lifetime (frame, stem, handlebar). Availability of spare parts: 2 years.