In a message dated 9/22/01 6:59:42 PM Eastern Daylight Time, Shrack04@aol.com
writes:
<< I have Pirelli Cinturato P3 - 165SR15 tyres on my TR3. As there is no,
series,, 60 or 70 or 80 called out on the tyres,, I did the string around
the tire measurement and came up with 79-1/2" circumference. Using a tyre
calculator it tells me they must be 165 / 80 X15 with a diameter of about
25.31". >>
It's especially important with a radial tire to know rolling radius as the
unloaded radius is much different due to it's soft sidewalls. The numbers
will also be a bit skewed since all tires grow a bit as wheel speed
increases.
Harold
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