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How's this math look?
New tire:
225mm * 0.45 = 101.25 sidewall height
(101.25) * 2 + (17" * 25.4mm/in) = 634.3mm tire diameter
634.3mm * π = 1992.7mm new tire circumference
New tread height 11/32" = 8.73mm
Current minimum tread height 8/32" = 6.35mm
8.73mm - 6.35mm * 2 = 4.76mm difference in diameter
634.3mm - 4.76mm = 629.54mm current tire diameter
629.54mm * π = 1977.8 current tire circumference
1992.7mm - 1977.8mm / 1992.7mm = 0.0075 = 0.75% difference in circumference
So if 1% is the limit, it seems like it would be okay to just replace the one, if I could figure out what it is.
Is the 1% limit just across each "axle" or does it apply front to back too?
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