Stolen Bike Check

Always check a bike's history before buying second-hand.

Bike Register

One of the world's largest cycle databases. Free check using the frame serial number. Used by law enforcement agencies globally.

Stolen Bikes

Community-run database of stolen bicycles reported by their owners worldwide.

National Cycle Register

How to check

Ask the seller for the frame serial number (usually stamped under the bottom bracket).
Run it through Bike Register — it's free and takes under a minute.
If anything looks suspicious, report the listing and don't complete the purchase.

Report it immediately so we can remove the listing and notify the authorities.