Quote:
Originally Posted by CargoBoatTails
well I guess we'll never know for sure with the odometer error on different height tires.
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Not exactly.
Many tire manufacturers will publish a Revolutions per mile value for their tires. Comparing those values between tire can give you a reasonably close value for the change in "geariing".
And just an FYI: There is no requirement that a tire be built to the dimensions given by the size designation. But most manufacturers do attempt to build tires to those dimensions. Just be aware that there are exceptions - usually because a vehicle manufacturer doesn't have enough room under the fenders for the "correctly sized" tire.
Also, the rolling diameter is about 97% of the freestanding diameter (the value usually published. If you do the math on any given tire, the published overall tire diameter is about 97% of the the value needed to get the Revs/mile.