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24.7mm
That looks like the diameter difference. The change in BB height will be half that.
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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.
gbj_tester
Tijs
@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?