Chime in if I'm wrong , first number is width like say 235. The second is the height aspect . 235/55/16 would be 235 wide and 55% of that tall.
a 235/60 or 65/15 is going to be as tall as a 235/55/16
and regardless of what size rim, be it 15 or 20, it's the over all diameter that affects road speed
A 235/60/15 is aprox 26.1 diameter
A 235/45/18 is 26.33
A 235/45/20is approx 26.75
Last edited by drew_vigil; 02/28/2013 2:48 AM.
