Re: 165/HR/whatever tire size comparisons

[dsedon@domain.elided]

paul mitchell sez:
"A new "vintage" Michelin XAS (from Coker Tires) in 165 HR 14 has an
overall diameter of 24.5 inches; a newer 185-70-14 averages around 23.7
inches, and a 195-65-14 at 23.5. A one-inch difference in rolling diameter
effectively lowers the car's gearing substantially, resulting in many more
revs per mile. Someone else is welcome to do the math to calculate how many
for a particular car."
=========================
paul is right - there's a gear-reduction thing goin' on.  23.7 is .967 of 24.5; that means yure really doin' 67.7 if the speedo is otherwise accurate when it sez 70...  w/the smaller 23.5 tires, that's .959, & you'll be doin' 67.1 at an indicated 70mph.

someone else
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