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Tijs in reply to @Thrust

The difference between a 700c wheel with a 38mm tyre and a 26" with 2.25 is 24.7mm.

Does that mean a 2.5cm lowering in BB when chucked on a bike?

Diameter of a 700c wheel with a 38mm tyre: 698.00mm;
Diameter of a 26" wheel with a 2.25" tyre: 673.30mm.

So the bb drop is (698.00-673.30)/2 = 12.35mm.

[Source]

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gbj_tester in reply to @Tijs

[Source]

You've pulled the OD from the 635 rim table, scroll down to 622 and it agrees with me.

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Tijs in reply to @gbj_tester

You've pulled the OD from the 635 rim table, scroll down to 622 and it agrees with me.

Yep, you're right. Had a brain fart and looked under 28". Thanks for the correction. Edited my original response.

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