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Rockrider ST100, Mountain Bike Shorts, Men's
The ST 100's built-in foam pad is designed especially for men. Unlike classic shorts, these shorts absorb vibrations and prevent rubbing and irritation.
Free returns
Free shipping over $35
Free pickup
San Francisco, 735 Market St. Options
Select an available color and size to see options.
Product Features
Resistant to wild vegetation
The "warp and weft" fabric withstands rubbing and snags.
Seat comfort
Preformed foam pad. The seams are positioned to prevent chafing.
Freedom of movement
Enjoy the wide cut, stretch fabric, and elasticated waist.
Breathability
With undershorts that effectively wick away perspiration.
Pockets
Take everything you need in the flap pocket on the right thigh.
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Product Customer Reviews
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The listed is EU sizing, so the US size varies. An EU small is an US extra small, an EU medium is an US small.
Shorts are comfortable and fit well, only issue is that the padding is to thin.
Reasonable price and good quality
Purchased this product to use mountain biking...comfortable and functional at a great price. Recommend
Cheaply made. After tying the waist it ripped the elastic waste band. The shorts don’t ride well. Will be returning them
I wasn't expecting much from these but they are as comfortable as shorts that cost double, highly recommended.
I was reading the other comments from India, UK and the Philippines and was very skeptical about this pair of shorts when I aw so many 1 and 2 star reviews. You need to remember that these are UK sizing on the website, not USA sizing, so a 38 is not going to be a 38 waist USA (a 38 UK is more like a 29-30 USA). Anyways, I ended up buying these because the memory foam seat cover that I also bought from decathlon was starting to wear away. This shorts were amazing! I have never felt so good or had such a comfortable ride EVER in the 25 years that I have been riding. I do not like the spandex-type shorts, especially since foam padding makes those types of shorts look very unattractive. These look like board shorts (they are long and will reach close to your knees). The sizing was spot on. I wear 33 inch waist USA jeans, and I chose the 42 S-M size shorts. Many of the comments are totally not understanding the sizing. One comment said a 39 inch waist corresponded to a medium.....um..no it doesn't.. (a 39 inch waist is more like an XXL.) Do not be dissuaded by the negative comments. These are stylish, comfortable, and correctly sized short. If they had more in stock online in M, I would buy more!
not too flexible, but do the job
Used it once loved them
Slim fit so beware.
These may well be a great pair of short but I couldn't comment on that. The two pairs I purchased were supposed 99cm to 106cm waist, they were actually closer to 84cm to 91cm so they were returned
Comfy
I was a little apprehensive after reading a few reviews regarding sizing but they fit perfectly, so guessing that other shoppers are not checking the sizing guide and ordering waist instead of hip sizes. Overall quality appears to be good and the only downside is that the seat padding is not quite as thick and supportive as other products i've purchased from Decathlon, but for this price they are much better than I was expecting and I will be purchasing another couple of pairs as soon as they are back in stock. .
Ordered a medium as they allegedly fit a 39 inch waist. Couldn't get them past my knees so returned for an XL. Still too small. I can wear them but can't get onto my bike in them as they are so tight. I think you really need to work with your suppliers to get more accurate sizes. Really annoyed at the hassle. Avoid!
Make sure when you look at the sizing guide you measure your HIPS and not WAIST. No idea why as this is the first time in 35 years I've ever seen men's shorts/trousers measured in hips and not waist! Needless to say I ordered the wrong size!
Size Guide
Additional Product Information
Composition
Main fabric
- 100% Polyester cationic
Inner fabric
- 84% Polyester cationic
- 16% Spandex
Padding
- 56% Polyester cationic
- 40% Polyurethane
- 4% Cotton
Cycling shorts, the mountain bike rider's kilt
Don't forget: you wear cycling shorts without underwear. Why? Wearing underwear risks causing irritation. Your skin can rub against the seams and elastic of your underwear. Chafing, shearing, all combined with perspiration (heat + humidity)... this is quite the recipe for infections. That is why we design our shorts with anti-bacterial pads. Dare to wear shorts without underwear!
Our care tips
Machine wash inside out on a synthetics cycle at 86°F. Do not use too much detergent, and do not use fabric softener. It is best dried on a hanger in a warm, well-ventilated place.
Origin
Imported
Product testing
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.
Free Shipping Over $35
Exceptions Apply
Free In-Store Pickup
Free One Year Returns
Exceptions Apply
Over 91% 4-5 Star Reviews
Superior quality. Unbeatable prices.
For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.
Decathlon makes the difference
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Research and development
delivers high-quality cost-effective products
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State-of-the-art production processes
minimize manufacturing costs
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Optimized supply chain
reduces retail prices
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Minimal retail footprint
lowers overhead and indirect costs
Rockrider ST100, Mountain Bike Shorts, Men's
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Heavy products return policy
If you return a product you will receive a refund for the purchase price plus any applicable sales taxes, less any non-refundable charges.
Decathlon will cover all shipping costs associated with your return except for items excluded from our return policy such as bikes, basketball hoops, snowboards, surfboards, tents, and other larger / heavier items.
Return costs for heavy products:
| Weight Thresholds | Shipping within California | Shipping outside of California |
|---|---|---|
| > 9 lbs | $20.00 | $25.00 |
| > 30 lbs | $50.00 | $65.00 |
| > 100 lbs | $100.00 | $125.00 |
| > 200 lbs | $200.00 | $230.00 |
If you return a product at any of our store locations, we will gladly help you find the best alternative product or refund you on the spot.