I was looking at a used aluminum frame Cannondale from 2017 but the serial number sticker is missing:

Cannondale bikes will display the serial number on the underside of the frame. It’ll be next to a bar code.

cannondale bike bottom bracket with serial number sticker highlighted

Source: Cannondale registration pgae

I was wondering if the serial number can be found somewhere else on the frame in case of a missing sticker. I have seen it stamped below the bottom bracket in other brands' aluminum frames, but not on this bike.

Thanks for your help!

  • Sometimes there's a number (though usually not the serial number) on one of the rear dropouts. Feb 4, 2021 at 1:07
  • 2
    A missing serial number on a second hand frame could point towards a dubious provenance a.k.a theft.
    – Carel
    Feb 5, 2021 at 15:07

1 Answer 1


I heard back from Cannondale support. The sticker is the only way to know the serial number on their newer bikes:

No, the serial number is not stamped on the frame. It is underneath the bottom bracket on a sticker with a bar code, 2 letters + 5 numbers.

  • 2
    Way to go Cannondale great way to help the bike thieves!
    – Tom Dooley
    Aug 3 at 15:20

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