185/60-R15 tires are 0.3 inches (7.5 mm) larger in diameter than 195/55-R15 tires and the speedometer difference is 1.2%.
185/65-R15 tires are 0.73 inches (18.5 mm) smaller in diameter than 185/70-R15 tires and the speedometer difference is 2.9%.
Nov 7, 2014 ยท If you are curious, the most common tire size is the R15. The most common tires used with the R15 size are the P235/75R15, P205/65R15, and the P215/70R15. An R15 tire is fitted with a 15-inch rim. The P tire variant is the most common R15 tire. This tire is made and designed for normal average passenger vehicles.
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