Hi Aaron,

On pages 50 and 53 it says a 20" bicycle wheel and the exact dimension is 22". What I've found is if you go buy a 20" bike rim it will actually measure 16 1/2". So if you want a rim that actually measures 22 1/2" you have to buy what they call a 26" tire. It seems they count the width of the rubber tire in addition to the rim when determining the tire size. So I'm not sure I understand why you call it a 20" bike wheel? Interestingly, the specs Tom C. gave for an 8 filar were for a 16" diameter rim, which would be what they sell as 20".