245/45R20 tire size

A 245/45R20 tire is 245 mm wide with a sidewall 45% of its width (110.2 mm), fits a 20-inch rim and has an overall diameter of 728 mm (28.7 in).

DimensionMetricImperial
Section width245 mm9.65 in
Sidewall height110.2 mm4.34 in
Rim diameter508.0 mm20 in
Overall diameter728.5 mm28.68 in
Circumference2,288.7 mm90.10 in
Revolutions437 per km703 per mile

Reading the size 245/45R20

245Width in mm45Aspect ratio (sidewall % of width)RRadial construction20Rim 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 245/45R20

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
275/40R20728 mm-0.1%99.9Compare
225/60R18727 mm-0.2%99.8Compare
225/55R19730 mm+0.2%100.2Compare
225/65R17724 mm-0.6%99.4Compare
235/75R15734 mm+0.7%100.7Compare
235/70R16735 mm+0.9%100.9Compare
225/70R16721 mm-1.0%99.0Compare
235/65R17737 mm+1.2%101.2

Compare 245/45R20 with any size →

Other 20-inch sizes

245/35R20245/40R20245/50R20255/35R20255/45R20255/50R20265/50R20275/40R20275/45R20275/55R20275/60R20275/65R20