Quote:
5mm of wear on your tire reduces your speed from 60mph to just barely over 59mph (at least with my 235/45-17 sample set). Just for reference.


Yeah... the math checks pretty close. 17 inch rim, probably about 26" overall tire diameter =~ 6500 mm. 5mm wear = 10mm reduction in diameter, 10/6500 = 1.5% reduction in wheel diameter. 60 MPH minus 1.5% = 59.1 MPH.

tanstaafl.
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