My 650 needs tyres. Currently 3.5 x 19 and 4.5 x 17 imperial.
I realize 3.5 is going to be approx 90 mm width and 4.5 is going to be 110 /120 mm.
When looking on the web for replacements they have the second number which is guess is the profile as a percentage of the width (the same is a car tyre)
My question is what profile percentage would be closest to the original imperial tyres, most of the ones seem to have listed 70,80 and 90.
Hope this makes sense.