Original tire
Sidewall: 4.73 in
Radius: 11.73 in
Diameter: 23.47 in
Circumf: 73.73 in
Revs/mile: 859.37
New Tire
Sidewall: 4.37 in
Radius: 11.87 in
Diameter: 23.74 in
Circumf: 74.58 in
Revs/mile: 849.54
Speedometer reading with new tire is 1.16% too slow.
When your speedometer is reading 60mph you are actually traveling 60.69mph.
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