My 1996 Dodge shows 225/75-16, 245/75-16 and 265/75-16 tires are all "original equipment" sizes. But unless I misunderstand the process, (assuming the speedometer is calibrated for the 245 tires) the error in speedometer readings will be about +/- 4% for the other tire sizes. Using an aspect ratio of 70 reduces the error by about a factor of 4 for the wider tires. Why doesn't the manufacturer recommend the reduced aspect ratio?
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