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What bottom bracket type is this?

Bicycles Asked on September 27, 2021

Can you help me identify the bottom bracket for the following please.

The frame is a Norco One25 (version 3)

It does not appear to have internal threads.

The diameter is approx 6.3cm and the length is approx 7cm

It is an old dirt jump bike style frame – maybe from 2003.

I found a picture of the frame here, https://webimg.secondhandapp.com/w-i-mgl/5af860e8d31b2f5a14ce2cca

Thanks.

enter image description here

One Answer

It appears to be American. Corroborate 51mm bore. If so that's what it is. It wants a BMX three piece and matching BB, depending on your crank choice. Mid didn't exist in 03, or at least that was a few years before its mainstream emergence.

Answered by Nathan Knutson on September 27, 2021

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