>on 7/20/01 11:41 AM, Aristotle Sagan at killer_jupiter@HOTMAIL.COM wrote: > > > You have a couple of choices tire sizewize... > > 205R65-15 or 215R60-15 are both about the equivalent of a 195R78-14. The > > 185R7814 is a bit smaller. > > > > As your tire size (circumference) goes up, your speedo reads slower. > > >by what percentage? i mean, if i am showing 65, i'm going what, 67? > >bill >'87 syncro westfalia Specification Diameter Circum Revs/Mile Diff 185/80-14 25.7in 80.6in 786 0.0% 215/60-15 25.2in 79.0in 802 -1.9% 205/65-15 25.5in 80.1in 791 -0.6% 195/75-14 25.5in 80.2in 790 -0.5% 205/70-14 25.3in 79.5in 797 -1.4%
Or use this... http://miata.net/garage/tirecalc.html
tim
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