255/70R18 tire size
A 255/70R18 tire stands 32.1 inches tall and 10.0 inches wide, with a 7.0-inch sidewall on an 18-inch rim.
- Overall height
- 32.1 in814 mm
- Section width
- 10.0 in255 mm
- Sidewall height
- 7.0 in179 mm
- Rim diameter
- 18 in457 mm
- Circumference
- 100.7 in2558 mm
- Revolutions per mile
- 629391 per km
- Inch size
- 32.1x10.0R18
Compare it with any other size in the tire size calculator.
Sizes you can swap to
These 18-inch sizes are within two width steps and 3% of a 255/70R18's overall height, the usual limit before the speedometer, ABS and transmission notice. The closest is 275/65R18, 0.1% taller (0.02 in). Wider sizes also need room in the wheel well and a rim width that suits them.
Plus and minus sizes
Changing rim size means changing the sidewall to keep the same overall height. On 16-inch or 17-inch or 19-inch or 20-inch rims, these are the closest matches to a 255/70R18.
Other 18-inch sizes near 255/70R18
255 mm wide, other sidewalls
70 series, other widths
See the other sizes for this rim on 18-inch tire sizes.
Shop 255/70R18 tires
These open each store's own list of 255/70R18 tires, where you can filter by type, load and speed rating.
255/70R18 questions
How tall is a 255/70R18 tire?
About 32.1 inches (814 mm) from the ground to the top of the tread, unloaded. On the vehicle, carrying weight, it sits a little lower.
What does 255/70R18 mean?
255 is the section width in millimetres (10.0 in). 70 means the sidewall is 70% of that width: 179 mm, or 7.0 in. R means radial construction, and 18 is the rim diameter in inches.
Can I use 275/65R18 instead of 255/70R18?
275/65R18 is 0.1% taller (0.02 in) and 20 mm wider, which is inside the usual 3% rule. With it fitted, the speedometer shows 60 mph when you are doing 60.0 mph. Make sure the extra width clears the suspension and fender liner at full lock.
What is 255/70R18 in inches?
In inch terms it is 32.1x10.0R18: 32.1 inches tall, 10.0 inches wide, for an 18-inch rim.
How many revolutions per mile does a 255/70R18 make?
About 629 turns per mile, worked out from its unloaded circumference of 100.7 inches. Makers list slightly higher numbers for their own tires, because a loaded tire rolls on a smaller radius.