Originally posted by Kodachrome Wolf
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The two sizes are close enough in diameter that it isn't much of an issue to switch between them. When I went from 215/75R15 to 225/70R15 on my Cutlass, it actually made the speedometer (well, the odometer is what I checked then) more accurate, but that car predated metric tire sizing and modern 215s are an inch shorter than their '70s counterpart while the 225s are nearly a dead ringer for the old GR70-15.
I checked this car against a GPS and the speedometer reads 2% high, so the bigger tires help in that respect as opposed to the 215s.
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