# Where is the frame number on a Rockrider bike? Canonical: https://www.cyclesite.co.uk/trust/frame-numbers/rockrider Last reviewed: 2026-08-14 **Quick answer:** The frame number on a Rockrider is usually stamped underneath the bottom bracket, between the pedals, and is often repeated on a barcode label. On the electric E-ST models the motor housing can cover the shell, so check the down tube as well. On a Rockrider, check underneath the bottom bracket first. Rockrider is Decathlon’s mountain bike range and is one of the most common first mountain bikes in the UK. Like other Decathlon frames it often carries both a stamped code and a printed barcode label. ## Start under the bottom bracket. This is the most common place to find a Rockrider frame number. It is the part of the frame between the pedals, on the underside. 1. Put the bike somewhere safe and well lit. 2. Turn it upside down carefully, or place it in a workstand. 3. Look underneath the frame where the cranks meet the bike. 4. Wipe away mud, grease or road dirt. 5. Use a phone torch if the number is hard to read. 6. Take a clear photo before typing the number into a checker. ### If it is not under the bottom bracket - Near the rear dropouts, where the back wheel fits into the frame. - Around the seat tube. - On the underside of the down tube. - Near the head tube at the front of the bike. - On the original sales receipt. - In your Rockrider registration email or paperwork. - With the Rockrider dealer that sold the bike. ## What a Rockrider frame number looks like A unique alphanumeric code stamped into the frame and often printed on a label. The model reference such as ST 500 is not the frame number. ### Not the frame number - Rockrider ST 100 - Rockrider ST 500 - Rockrider ST 900 - Rockrider E-ST 500 - Decathlon product reference numbers - Frame size - Motor serial number - Safety standard numbers ## Buying a used Rockrider A clean-looking bike is not always a safe buy. Before you pay, ask the seller for a clear photo of the frame number and check it against stolen-bike records. You should also ask for: - The original receipt or proof of purchase. - The seller’s name matching the receipt where possible. - Clear photos of the bike from both sides. - A photo of the frame number. - Any service history. - Details of upgrades or replacement parts. ## Bottom line The quickest place to find a Rockrider frame number is underneath the bike, near the pedals. Look for a stamped code or barcode sticker, copy the full number, then check it before you buy, sell or register the bike. A used Rockrider can be a brilliant buy, but the frame number is the detail that protects you. ## Frequently asked questions ### Is a Rockrider frame number the same as a serial number? Yes. Most people use frame number and serial number to mean the same thing. It is the unique identifying code attached to the bike frame. ### Do all Rockrider bikes have a frame number? Most Rockrider bikes have a frame number or serial number. Check the locations described above first; on older frames the marking can be shallow or worn, so clean the area and check in good light before concluding it is missing. ### Where is the frame number on a Rockrider ST 500? On most Rockrider ST 500 mountain bikes, check underneath the bottom bracket first, the area between the pedals on the underside of the frame. ### Where is the frame number on a Rockrider E-ST 500? On most Rockrider E-ST 500 electric mountain bikes, check underneath the bottom bracket first. If the motor housing covers the shell, look along the underside of the down tube. The number on the motor casing identifies the motor, not the bike. ### What if the Rockrider frame number has been removed? Do not buy the bike. A removed or damaged frame number is a major red flag. It may make the bike harder to register, insure, resell or prove as yours. ### Can I check if a Rockrider bike is stolen by the frame number? Yes. Use the frame number to run a stolen-bike check before buying. You should also ask the seller for proof of ownership and check that the details match the bike. ### How do I register a Rockrider bike in the UK? Find the frame number using the locations described above, then record it against your Rockrider. It is free, and you need an account so we know where to send the alert. If that exact number is ever reported stolen to us, we email you. If anyone then lists a bike carrying it, the listing is hidden until the seller proves it is theirs. ## Related pages - Free stolen-bike check: https://www.cyclesite.co.uk/stolen-bikes - What a used Rockrider is worth: https://www.cyclesite.co.uk/value/rockrider - Stolen Rockrider bikes: how to check one before you buy: https://www.cyclesite.co.uk/stolen-bikes/guide/stolen-bikes-by-brand-rockrider - Used Rockrider prices by model: https://www.cyclesite.co.uk/value/rockrider - Frame numbers for other brands: https://www.cyclesite.co.uk/trust/frame-numbers Source: Cyclesite editorial, reviewed 2026-08-14. HTML version: https://www.cyclesite.co.uk/trust/frame-numbers/rockrider