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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

Diameter of a 700c wheel with a 38mm tyre: 711.00mm

That seems like a lot, I'd have guessed at more like 698mm. I've got some 38s waiting to go on, maybe I should do that and get my tape measure out :)

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