255/40R19 tire size

A 255/40R19 tire is 255 mm wide with a sidewall 40% of its width (102.0 mm), fits a 19-inch rim and has an overall diameter of 687 mm (27.0 in).

DimensionMetricImperial
Section width255 mm10.04 in
Sidewall height102.0 mm4.02 in
Rim diameter482.6 mm19 in
Overall diameter686.6 mm27.03 in
Circumference2,157.0 mm84.92 in
Revolutions464 per km746 per mile

Reading the size 255/40R19

255Width in mm40Aspect ratio (sidewall % of width)RRadial construction19Rim 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 255/40R19

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
255/35R20686 mm-0.0%100.0Compare
215/65R16686 mm-0.1%99.9Compare
235/60R16688 mm+0.3%100.3Compare
215/60R17690 mm+0.5%100.5Compare
235/55R17690 mm+0.5%100.5Compare
225/50R18682 mm-0.6%99.4Compare
215/70R15682 mm-0.7%99.3
235/50R18692 mm+0.8%100.8Compare

Compare 255/40R19 with any size →

Other 19-inch sizes

225/35R19225/40R19225/55R19235/35R19235/40R19235/45R19235/50R19235/55R19245/35R19245/40R19245/45R19255/35R19255/50R19255/55R19