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Mountain Bike Shorts ST 900

Sturdy and thick to withstand snags from vegetation.

4.3 / 5

Regular price


B Twin

Mountain Bike Shorts ST 900 designed for pushing your limits and escaping when mountain bike touring at an expert level. Embark on adventures on all types of terrain.

These shorts (with no pad) are sturdy and thick: they won't get snagged as you ride. The stretch fabric provides freedom of movement. 2 flat secure pockets. The little extra: 2 rip-tabs at the waist.
Abrasion resistant

Sturdy and thick to withstand snags from vegetation.

Freedom of movement

Made from stretchy fabric, with 2 rip-tabs on the waistband to adjust the size.


2 flat zip-up pockets for keeping your belongings secure (such as keys).


The fabric and loose fit wick away perspiration.

Our tip: wear undershorts for added comfort!

At Rockrider, we recommend adding undershorts with a pad under your 900 mountain bike shorts. The undershorts fit discreetly under your shorts. We must say: it is certainly more comfortable with a pad. The 500 and 900 mountain bike undershorts are compatible with the 900 mountain bike shorts.

Care tips

Machine wash at 86°F. Synthetics cycle. Turn the article inside out. Use a minimal amount of laundry detergent. Do not use fabric softener. Line dry in a warm, ventilated area. Do not tumble dry.Do not dry clean. Do not bleach. Do not place on a heater to dry.

Product tests

Our team of product designers based at the B'Twin Village in Lille, France is continuously working to make cycling more comfortable for our users. Our mission is to create products that meet the specific cycling needs of our users and to eliminate obstacles to a good cycling experience. We then test our products in the field, as we are convinced that only by subjecting them to real world conditions can we continuously improve our products.

Product Testing

Our engineers have all of our products tested by mountain bikers in real conditions. These tests complement the tests we do in the lab and mean that we can approve our products before they go on sale.


Main fabric : 85.0% Polyamide, Main fabric : 15.0% Spandex

Care Instructions

Machine washable. Do not tumble dry.



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