(travelers rest, sc, USA)
would having p185 65r14 tires on a saturn that calls for p175 70r14 tires make the speedometer register 8 mph slow. I got pulled for doing 80 in a 65, and my speedometer only said 72.
If your speedometer showed you were doing 72 you were still speeding along at more than 71 mph because the error produced by using 185/65R14 tires on a car calibrated to use 175/70R14 tires would be 0.75%. That is your real speed would be LESS than what your speedometer reads by 0.75%.
For the purposes of speedometer reading these tires are a very close match to the OEM tires on the Saturn.
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