235/65R18 tire size

A 235/65R18 tire is 235 mm wide with a sidewall 65% of its width (152.8 mm), fits a 18-inch rim and has an overall diameter of 763 mm (30.0 in).

DimensionMetricImperial
Section width235 mm9.25 in
Sidewall height152.8 mm6.01 in
Rim diameter457.2 mm18 in
Overall diameter762.7 mm30.03 in
Circumference2,396.1 mm94.33 in
Revolutions417 per km672 per mile

Reading the size 235/65R18

235Width in mm65Aspect ratio (sidewall % of width)RRadial construction18Rim 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 235/65R18

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
255/50R20763 mm+0.0%100.0Compare
255/55R19763 mm+0.1%100.1Compare
255/60R18763 mm+0.1%100.1Compare
255/65R17763 mm+0.1%100.1Compare
255/70R16763 mm+0.1%100.1Compare
275/45R20756 mm-0.9%99.1Compare
245/50R20753 mm-1.3%98.7Compare
265/50R20773 mm+1.4%101.4

Compare 235/65R18 with any size →

Other 18-inch sizes

215/45R18215/55R18225/40R18225/45R18225/50R18225/55R18225/60R18235/40R18235/45R18235/50R18235/55R18235/60R18245/40R18245/45R18245/60R18255/55R18255/60R18255/65R18255/70R18265/35R18265/60R18265/65R18265/70R18275/65R18275/70R18