first thing on deciding size - how does it effect your speedometer
check here you need java installed to use it
http://www.miata.net/garage/tirecalc.html
"j." <none@none.com> wrote in message
news:AsadnYGUKYeCax3VnZ2dnUVZ_t_inZ2d@sofnet.com.. .
>I have a 2006 Saturn Ion that has P195 60 R15 size tires. Would it be OK to
>replace with P195 70 R15.....or maybe P195 65 R15 size tires. Would it make
>much difference in the way the drives on curvy paved roads?
>