Whats the difference? Which has a bigger contact patch? I think squeezing the 190 on a 5.5 just reduces the sidewall patch because the sides get pinched. But why do I see many sport riders with the 190 on a 5.5 inch? Just for looks? Or do you really get a bigger side wall patch? Just want to know the difference in handling. Maybe some people who have ran both the 180 and 190 on a 5.5 can tell me what the difference is. Thanks in advance.