185/65R15 tire size

A 185/65R15 tire is 185 mm wide with a sidewall 65% of its width (120.2 mm), fits a 15-inch rim and has an overall diameter of 622 mm (24.5 in).

DimensionMetricImperial
Section width185 mm7.28 in
Sidewall height120.2 mm4.73 in
Rim diameter381.0 mm15 in
Overall diameter621.5 mm24.47 in
Circumference1,952.5 mm76.87 in
Revolutions512 per km824 per mile

Reading the size 185/65R15

185Width in mm65Aspect ratio (sidewall % of width)RRadial construction15Rim diameter in inches

The load index and speed rating (for example 91V) follow the size on the sidewall. Replacement tires should match or exceed the original load index and speed rating.

Alternative sizes within 3% of 185/65R15

A replacement size should stay within about 3% of the original diameter so the speedometer, ABS and transmission stay accurate. Always check clearance, load index and the vehicle manufacturer's approved sizes.

SizeDiameterDifferenceSpeedo reads 100 → actual
195/55R16621 mm-0.1%99.9Compare
215/45R17625 mm+0.6%100.6Compare
205/45R17616 mm-0.8%99.2Compare
205/60R15627 mm+0.9%100.9Compare
195/60R15615 mm-1.0%99.0Compare
185/70R14615 mm-1.1%98.9Compare
195/70R14629 mm+1.1%101.1Compare
205/50R16611 mm-1.6%98.4

Compare 185/65R15 with any size →

Other 15-inch sizes

175/65R15185/55R15185/60R15195/50R15195/55R15195/60R15195/65R15205/60R15205/65R15215/70R15235/75R15