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Rockrider Adult ST100 27.5 Mountain Bike
Comfort first: CGF frame with raised position, 80 mm suspension, Ergofit hammock saddle with Flex stem, 27.5" wheels (26" in XS") so you stay comfortable as you ride.
Free shipping over $49
Final Sale: No returns or exchanges
Free pickup
San Francisco, 735 Market St. Options
Select an available color and size to see options.
About this item:
- Cycling comfort: Enjoy: the high position (CGF frame), 80mm suspension, hammock saddle, flex stem
- Efficiency: Progress: light frame, 21 speeds, 27.5” double-walled wheels (26”1 wall in XS)
- Precision: Control your path with tires with side lugs and V-brakes.
- Lifetime warranty:Rockrider offers a lifetime warranty on the frame, handlebars, and stem.
Product Features
Cycling comfort
Enjoy: the high position (CGF frame), 80mm suspension, hammock saddle, flex stem
Efficiency
Progress: light frame, 21 speeds, 27.5” double-walled wheels (26”1 wall in XS)
Precision
Control your path with tires with side lugs and V-brakes.
Product Lifestyle Image Gallery
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Questions & Answers
Look for product information, frequently asked questions, opinions...
Question:
Is the seat adjustable on this bike
Answer:
Yes, the seat can be adjusted in height with a quick release. No tool needed
Question:
What is the weight capacity for Large and XL bikes ?
Answer:
The maximum capacity is 140kg or 300 lbs.
Question:
I could see that this cannot be returned.But if there is a shipping or manufacturer defect how do I handle it...
Answer:
Please contact our customer service team at customer.service@decathlon.com or from our contact form page. To help start your claim we will need the following information: Customer name, USS order number, Item name and documentation (images/video) of the defect you have noted in your item. Please look to provide as much detail as possible, so our team can properly review your case.
Question:
decathlon bike st 100 had a flat tire today. both the tire and the inner tube are more like broken. Where can I find the manual for the Bike to get the information the tire and inner tube for replacement. I saw the tire said: 27.5x2.00 Thanks
Answer:
Indeed you can replace the tire with 27.5 x 2 to 27.5 x 2.5 tires. for the tube I recommend this size. https://www.decathlon.com/collections/bike-tubes/products/btwin-schrader-inner-tube-275-x-19-25-x-48mm-15167?variant=1518952448013
Question:
What is the inside front fork dimension? We're looking a roof racks and we need to know if we need adapters for a 100mm mount
Answer:
The measurement inside the fork, where the hub will be placed, is 100mm.
Question:
Is the bike true to size? For example is the small comfortable for a person at 5’4?
Answer:
Yes it is true to size. A small typically fits a person 5'1" - 5'5". Of course all people are build diffrently i.e long torso or legs - generally to sizing is accurate.
Question:
Does the bike have lights?
Answer:
This bike does not come with lights, they can be purchased seperately. The bike does come with reflectors.
Question:
What size should I order for my son? He is 6' and a half inch.
Answer:
XL will be the right size for him.
Question:
Does the bike come assembled? Does it need any additional parts to be purchased separately (like pedals) to start riding?
Answer:
This bike come 95% assembled, you will need to put on the front wheel and adjust the seat height. It does come with everything you need to ride it, including pedals. But a kickstand and waterbottle cages would be extra.
Question:
It shows shipping is 200$, can i pick it up from store?
Answer:
We do not have store in the U.S. but we offer a free pick up from our warehouse if you are in the Oakland CA area
Question:
Whats the box total weight and dimensions?
Answer:
It depends the model and size of the bike but assume 8" Thick 32" tall and 52" wide, weight boxed is aproxamately 40lbs
Question:
Do you sell the individual wheels? I need a replacement for the back wheel since I don’t have equipment to true the wheel
Answer:
No we do not, I would recomend going to your local bike shop. As they typically stock a wide variety of wheels
Question:
I am between 5'11 and 6'0. Which bike size should i purchase?
Answer:
A large should be a good fit for you
Question:
I am 6’2. Is XL good for me?
Answer:
yes - perfect
Question:
I am 6.2 feet tall. Would XL size be a good fit for me?
Answer:
yes - perfect
Question:
My rear tire went flat, ive tried removing the wheel and it wont budge, most youtube videos, including decathlons showcase rear wheels of different designs than this bike, where can i find a guide on removing it?
Answer:
Make sure you loose both bolts and slide the wheel forward, with the tire completely deflated. The design is standard. A Pro trick is to also shift the bike so the chain is in the small chain ring up front, and smalles gear in the back, putting the least amount of tention on the chain making the wheel much easier to remove.
Question:
Does it come with all the necessary accesories and guide to help assemble the remaining part of it?
Answer:
Yes, it does.
Question:
When will you have the medium size available?
Answer:
Unfortuanely not, we will not be stocking this model moving forward.
Question:
How much is the total weight including package and all, ready for shipping? I'd need to know this is to know if It can be shipped to my country or with that courier. Thank you
Answer:
40lbs.
Question:
Is it possible to change the brakes to disc brakes? on my own
Answer:
Unfortunately not. The frames and forks are specically designed and reinforced to accept Disc Brakes.
Question:
Is there any way to get free shipping? If the product is on sale?
Answer:
Unfortunately not... sorry.
Question:
Is the hub a freewheel or a cassette?
Answer:
This bike uses a 7 speed Freewheel.
Question:
Why is this item being labeled as a "kids" bike? I'm really confused. I don't know any kids that stand 6'5" in height riding a 27.5 inch bike? That's crazy, please help.
Answer:
Ha! you are 100% correct, our apologies. We have several similar junior models and the wording was not accurately updated. This is an adult bike.
Question:
Do you ship to Morocco?
Answer:
Not from the US but we have Decathlon Stores in Morocco.
Question:
What would the box size for a XL bike? I am trying to find out if I can pick up with my sedan
Answer:
It's 10'' wide x 35'' tall x 59'' long.
Question:
Do we need to buy the chain stay stand separately?
Answer:
Yes - A kickstand in not included with this bike.
Question:
It seems like only XL bikes are left. Can I ride it if I'm 5'10?
Answer:
Actually you can with this particular bike as they run small. Normally I would suggest a large, but with this particular model you will be fine with an XL.
Question:
Hi I need the full specks of my Rockrider ST100 sports Trail Bike where can I find the specs also I need to replace the chain there's is so many different chain specs , my bike is an XL Adult version Thanks
Answer:
Any 6/7/8 speed chain will work with your bike. You will need a chain tool to make it the correct legnth. I recomend taking it to a bike shop to have it done. Link to website for specs: https://www.decathlon.com/products/mtb-st100-rr-black-196952-192872?adept-product=mtb-st100-rr-black-196952-192872&variant=39456581320766&adept_product_id=mtb-st100-rr-black-196952-192872&source=search#product-information
Question:
I can't seem to find details on the alloy used in the frame - is this steel or aluminium construction? Thanks.
Answer:
Aluminium .
Question:
where can I get a replacement for my bikes quick release lock for the front wheel as I cant find it any where
Answer:
Any local bike shop should be able to help you.
Question:
Do you need to pump air in to the tube when the bike arrive? Does it comes with a pumper?
Answer:
Yes - any bike that sits more than a couple of days should have the tires reinflated. The bikes do not come with a pump - they cna be purcahsed seperately.
Don't see the answer you're looking for?
Product Customer Reviews
Modestly made bike, the gear change is noisy and the front brake pads touch the wheel rim, good sturdiness
Sturdy and at the same time lightweight.
Good bike
After three years of intensive use, I can safely say that the Rockrider ST 100 27.5-inch MTB mountain bike is a bull's eye! From the first rides, it delighted me with its solid construction and simplicity, which turns out to be a huge advantage in the field. Over the past three years, the ST 100 bravely endured various conditions - from forest paths to dirt roads. Its 27.5-inch wheels provide a great compromise between maneuverability and overcoming obstacles, which makes the ride smooth and comfortable. Despite intensive use, the bike still works flawlessly. Regular maintenance is enough to enjoy smooth gear changes and effective brakes. This is proof that the Rockrider ST 100 is not only a bike for the beginning of your MTB adventure, but a solid piece of equipment for years. My advantages: Durable construction: The frame is solid and withstands the rigors of off-road riding well. 27.5-inch wheel versatility: Agility and good obstacle handling. Simple and reliable operation: Failure-free for 3 years of use. Good value for money: A great choice for those looking for a solid MTB bike without overpaying. To sum up, the Rockrider ST 100 is a bike that I can recommend with a clear conscience to anyone looking for a reliable and pleasant to use mountain bike. After three years of adventures together, I am convinced that it will serve me for a long time!
Good daily bike, shame about the persistent brake noise
GOOD
Thank you Ssi Yassine for your advice and guidance. The bike is perfect, but thanks to you, it has become even more than perfect. Thank you very much, and thank you for the bike ride. It was very enjoyable. Bravo Yassine. Bravo to the whole Decathlon Tetouan team.
For the price, there's really nothing to complain about. I find the rear brake pads a bit weak, they brake. The weight disappointed me. It's heavier than my old Rockrider Vitamin, probably because of the suspension and maybe the frame too. The seat is more comfortable, but the turning radius is smaller. It's still a good bike.
very nice bike, low maintenance, holds the road very well...
Most adequate for everyday driving. It serves its purpose to this day.
Good evening, This bike is great for commuting and trail riding, but the freewheel body broke, and the derailleur shifted/bent after 1.5 years, despite regular maintenance.
Sturdy and durable bike
It was a gift for my son for his First Communion, and he's still delighted with it. It works wonderfully and is very durable.
very good bike, brakes well, perfect for going to work
A great mountain bike that's still going strong two years later. Everything's going well. Robust and efficient.
Size Guide
Additional Product Information
Composition
Bike frame : 100.0% Aluminum
A unisex sport bike
Available in a variety of sizes (XS: 4 ft9 Inch ~ XL: 6 ft7 Inch), the CGF frame is lightweight, comfortable, and versatile
How to choose the size of your bike?
S: 5 ft1Inch ~ 5 ft5Inch M: 5 ft5Inch ~ 5 ft9Inch L: 5 ft9Inch ~ 6 ft
Front shock absorber
The 80 mm SUNTOUR XCT front shock absorber is designed for rugged pavements, helping beginners easily cope with sporty bike rides. Mechanical springs are designed to be reliable and easy to maintain.
Transmission system
3 x 7 speed sprocket, 21 speed! Three-chain sprocket wheel (22/32/42 teeth) + grease protection - Microshift front derailleur - Microshift rear derailleur - with speedometer Microshift hand shift lever- 7 gears, 14~28 teeth Shimano sprocket
Horizontal / handle / handle
The ST100 sport bike has a 10° angled handle for a higher operating position and is easy to operate and comfortable.
Storage instructions
After washing, rub with a dry cloth to remove all traces of moisture.Store your bike in a cool, dry place, away from corrosive products and salty air.
Guarantee
Lifetime on frame and rigid fork. 2 years on parts.
Origin
Imported
Law label information
Rockrider Adult ST100 27.5 Mountain Bike
Your location: City, ST
Please enter a valid city with state or zipcode. Example: San Francisco, CA or 94101
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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.
