Check If a Bike Is Stolen
Updated April 2026
Before you hand over any cash for a used bike, run the serial number through Bike Index — the largest stolen bike registry in North America with over 158,000 reported stolen bikes. The check takes seconds and it's completely free.
This tool is useful for anyone buying a used bike — kids bikes, adult bikes, mountain bikes, road bikes. If the serial number matches a stolen report, walk away.
Stolen Bike Serial Number Checker
Enter the serial number exactly as it appears on the frame. Letters and numbers, no spaces needed.
Searches the Bike Index public database. A clean result does not guarantee the bike was never stolen — always ask for proof of ownership.
How to Find a Bike's Serial Number
Serial numbers are stamped directly into the metal frame during manufacturing. They are typically 6-12 characters long and may include both letters and numbers.
Flip the bike upside down. Look on the underside of the frame where the pedal cranks attach. This is where 90% of serial numbers live.
The front of the frame where the fork connects to the handlebars. Some brands stamp the serial number here instead.
The slot where the rear wheel axle fits. Less common, but used by some manufacturers — especially older bikes.
The vertical tube the seat post slides into. Look near the bottom where it meets the bottom bracket area.
What If There Is No Serial Number?
All bikes sold in the US since 1976 are required by federal regulation to have a serial number. If you cannot find one at all, possibilities include: it was deliberately removed (stolen bike red flag), the sticker-based number fell off (less common), or it is a very old or non-US bike. When in doubt, pass on the purchase.
Red Flags When Buying a Used Bike
Even if a serial number comes back clean, watch for these warning signs that a bike may be stolen:
- Scratched-off or filed serial number — The most obvious red flag. Thieves remove serial numbers to prevent identification. This alone is reason to walk away.
- Fresh spray paint covering original color — A coat of spray paint is a quick way to disguise a stolen bike. Look for overspray on cables, brakes, and logos.
- Price significantly below market value — A premium kids bike (Woom, Prevelo, Frog) rarely sells used for under $80. If the price seems too good to be true, it usually is.
- Seller can't answer basic questions — Legitimate sellers know what bike they're selling: the brand, why they're selling it, how long they've had it. Evasive answers are a warning sign.
- No original receipt or purchase history — Most parents keep receipts for expensive kids bikes. If the seller claims they lost all documentation, be cautious.
- Seller wants an unusual meeting location — Insisting on a dark parking lot, a distant neighborhood, or refusing to meet at a police station safe exchange zone are red flags.
What to Do If a Bike Is Reported Stolen
- Do not buy it. Knowingly purchasing a stolen bike can expose you to legal liability, even if you did not steal it.
- Note the serial number and listing URL. Screenshot the listing before it disappears. Write down every detail you can — username, phone number, photos.
- Report it to local police. Call your non-emergency police line and provide the serial number, listing URL, and any contact information for the seller. Police can take it from there.
- Report it to Bike Index. Go to bikeindex.org/stolen_notifications to alert the registered owner that their bike has been found.
- If you already bought it — contact police right away. A good-faith purchase does not give you ownership of stolen property under the law. You may be required to return the bike to its owner, but police can help you pursue reimbursement from the seller.
Also Check for Safety Recalls (CPSC)
Beyond theft, it's worth verifying a used bike hasn't been recalled for a safety defect. The Consumer Product Safety Commission (CPSC) maintains a public database of all product recalls. Some recalled bikes have defective brakes, forks that can crack, or other hazards.
Bike Recall Checker
Enter the bike brand (required) and model name (optional) to search CPSC recall records.
Data from the CPSC SaferProducts API. Results are limited to bike-related recalls for the manufacturer you enter.
A recall doesn't mean the bike is unusable — many recalls have free repair programs. Search for the recall number on the manufacturer's website to find out whether your bike qualifies for a free fix.
Protect Your Bike: Register It on Bike Index
If you own a bike — especially a quality kids bike worth $100 or more — register it now before it gets stolen. Registration is free and takes about two minutes:
- Go to bikeindex.org and create a free account.
- Enter your bike's serial number, make, model, color, and wheel size.
- Add photos (highly recommended — it helps with recovery).
- Save the registration confirmation and keep a copy of the serial number.
If your bike is ever stolen, report it through your Bike Index account. The report immediately becomes searchable and can generate alerts for local pawn shops and bike shops.
Buying a Used Kids Bike?
Our free tool checks bike size, runs the stolen check, searches 7 marketplaces at once, and gives you a full safety inspection checklist — all in one place.