Bike Serial Number Lookup: Check if a Bike Is Stolen
Look up a bike serial number for free before you buy a used bicycle or e-bike. Enter the frame serial and see in a few seconds whether the bike is reported stolen.
2 free checks · No credit card · Updated October 7, 2026
Quick answer
How do I check if a bike is stolen?
Turn the bike over and read the serial number stamped under the bottom bracket, where the pedal cranks meet the frame. Enter it on SafeOrStolen (safeorstolen.com/check-bike), which searches a national stolen-bicycle registry, SafeOrStolen theft reports and public web results in a few seconds. The first 2 checks are free. Ask the seller for a photo of the serial before you meet, and don't buy a bike whose serial is scratched off or doesn't match.
Where to find the serial number on a bike
Bikes do not have a VIN. The frame serial number does the same job, and it is what owners give the police and registries when a bike is stolen.
| Bike | Where to look |
|---|---|
| Most bikes | Under the bottom bracket, the shell where the pedal cranks pass through the frame. Turn the bike upside down to read it. |
| Some road and kids' bikes | The head tube at the front, the seat tube, or a rear dropout near the back axle |
| E-bikes | The frame serial in the same places, plus separate numbers on the battery, motor and sometimes the display |
| Paperwork | The original receipt, the warranty card, or the shop's sales record |
Signs a used bike is stolen
- The serial number is ground off, painted over or hidden under a sticker
- The seller won't send a photo of the serial before you meet
- The price is far below what the same model sells for used, with a "must sell today" story
- Cut lock marks on the frame, or a lock still attached
- The seller doesn't know the size, the model or basic details of the bike
- An e-bike whose app, key or tracker can't be removed from the seller's account, or whose battery number doesn't match their receipt
What a no-match result means
A no-match result means the serial wasn't found in the records searched. It isn't proof the bike was never stolen: many owners never write down their serial number, and thefts are reported to different police departments and registries. Use the red flags above and buy only when the seller and the bike add up.
What a Bicycle check looks for
A bike serial number lookup checks whether a specific bicycle has been reported stolen. Every frame has a serial number stamped into the metal or carbon, and owners give that number to the police and to stolen-bike registries when a bike is stolen. Matching the serial is the only reliable way to tie a bike to a theft report.
Step by step
Ask the seller for a photo of the serial number under the bottom bracket before you agree to meet.
Enter the serial on SafeOrStolen and read the sources searched.
At the meetup, turn the bike over and make sure the serial matches the photo.
For an e-bike, check the battery and motor numbers against the receipt and have the seller remove the bike from their app.
If the serial is reported stolen or has been tampered with, don't buy it, and pass the listing to your local police.
Type the frame serial into the search box. SafeOrStolen searches a national stolen-bicycle registry, its own theft reports and public web results for that serial, and lists every source it searched. If there is a match, you see what the report says. Every check is saved to your account with the date.
Why check before you buy
Bikes are among the most commonly stolen items and are resold quickly online. If you buy a stolen bike, police can return it to the owner and you lose what you paid. A serial check takes a few seconds and is the step most likely to catch a stolen bike before you hand over money.
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