Fatbike frame number: where to find it and what it’s used for

Direct answer: The frame number of a fatbike is usually located under the bottom bracket or on the frame near the motor. It is used to prevent theft, prove ownership and register the bike.

Why is the frame number especially important for fatbikes?

Fatbikes are popular and relatively expensive, which makes them attractive targets for bike theft and illegal resale.

Where is the frame number on a fatbike?

On most fatbikes, the frame number can be found:

• Under the bottom bracket
• On the down tube of the frame
• On electric fatbikes: near the motor or under the battery

In some cases, the number can be difficult to spot.

What can you do with a frame number?

A frame number allows you to:

• Check if a fatbike is stolen
• Register the fatbike
• File a theft report
• Prove ownership

Tip when buying secondhand

If the frame number is missing or unreadable, do not buy the fatbike. This is often a warning sign.