Originally Posted by
Peter_C
Am sorry, but I think you said that a bit wrong?
The tire's (when you and gear is on it) *height* should drop 15% of the *WIDTH* of the tire. So, if the width of the tire is 40mm, 15% would be 6mm.
Sure, but the cross section of a bicycle tire is pretty close to a circle so the width of that circle is also equal to its height. The diagram in the BQ article shows the width measurement, but AIRC, Berto talked about the percentage drop in the tire height, i.e. distance from the contact point to the bead. The two are generally close enough that you can use either measurement.