Quote: Any idea what the dia was on 14" tires on a 68 GTX with stock wheels (magnums?) a rough estimate so I can figure what my RPM was when I went to California in '76 with the 4:10's and the speed limit was still 70MPH? iirc they were F70-14
I'm guessing there were more numbers to the left of the tach needle that you didn't have than to the right.
