Serial numbers

All bikes 1 all have unique serial numbers.

Most bicycles have their serial number engraved beneath their bottom bracket, but sometimes serial numbers are found in other places. Here are some examples of where and what to look for:

  • Bike with bottom bracket circled

    The bottom bracket (where serial numbers are typically located) is circled.

  • Standard serial number

    A serial number on the underside of a bottom bracket.

  • Another standard serial number. Sometime to be replaced with a serial number covered up by routing.

    Another serial number beneath the bottom bracket, aligned parallel to the frame.

  • Schwinn Serial.

    Some Schwinn bicycles have the unique identifying number on their head tube (which is on the front of the bike).

  • Doberman dropout serial number

    A serial number located on a rear drop out. Some BMX bikes and a few Schwinn bicycles place the serial on the rear dropout. On older Schwinns there are numbers stamped on both the drive side and non-drive side rear dropouts; the one on the non-drive side dropout is the serial number.

  • Look serial number

    Some bikes have multiple serial numbers. 2 When adding a bike to the Index, it's best to enter all the groups of numbers and letters separated by spaces.

Hopefully you can find the serial number on the bicycle you're looking at, email if you're having trouble.

  1. Okay, fine, so maybe there are a few bikes without serial numbers, but this is rare and typical only on hand made bikes or really old bicycles.
  2. In this picture 200910427-2A is a manufacturer number and not a serial number. However, to make bikes as easy as possible to find, we'd love it if you entered all numbers you encounter.