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Checking a bike frame number before buying: what you need to know

TL;DR: Before buying any second-hand bike or marketplace listing, locate the frame number, write it down exactly, and verify it in a bike registration database like BIKEBAZE to confirm it is not reported stolen. A missing or filed-off frame number is a serious red flag, so walk away.

ByTeam BIKEBAZE··Last updated:

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Direct answer: When buying a bike, it is important to check the frame number. This helps you avoid purchasing a stolen bike and ensures everything is legitimate.

When should you check a frame number?

Always check the frame number when:

  • Buying a secondhand bike
  • Purchasing via online marketplaces
  • The bike has no proof of purchase

How do you check a frame number?

You can check a frame number by:

  1. Locating the number on the bike
  2. Writing it down exactly
  3. Checking it in a bike registration database
  4. Verifying whether the bike is reported stolen

What if the frame number is missing?

A missing or removed frame number is a serious red flag and often indicates theft.

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