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BB height is a measurement that depends on too many ill defined parameters to be useful. A rough approximation for three height of a tyre is to take its nominal width. That leaves us with a discrepancy of about 8 mm. Spezialized seem to have used either a height from the tyre manufacturers data sheet or actually measured themselves. Tyres deviate from a ...


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There are several things that may be at play here. Tires bulge like a balloon out of the rim. Thus, tire height in general is more than tire width because tire is higher than a half circle. So it is untrue that a 25mm wide tire is 25mm high too. Firstly, most road tire purchasers look at tire weight and make a purchase decision based on the tire weight. Thus,...


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