245/60R18 tire size
A 245/60R18 tire stands 29.57 inches tall overall, on a 18-inch wheel, with a 147 mm sidewall and 245 mm of tread across. It turns roughly 682 times per mile.
- Overall diameter
- 29.57″
- 751.2 mm
- Sidewall height
- 147.0 mm
- 60% of 245 mm
- Circumference
- 92.9″
- 2,360 mm
- Revs per mile
- 682
- 424 per km
Reading the number
245 / 60 R 18 │ │ └─ rim diameter, 18 inches │ └──── aspect ratio, sidewall is 60% of width └──────── tread width, 245 mm sidewall = 245 × 0.60 = 147 mm diameter = (18 × 25.4) + (2 × 147) = 751.2 mm
Sizes that can replace 245/60R18
One rim step away, sorted by how close the rolling diameter stays.
Questions
›What does 245/60R18 mean?
245 is the tread width in millimetres. 60 is the aspect ratio, so the sidewall is 60% of 245 mm, or 147 mm. R means radial construction, and 18 is the wheel diameter in inches.
›How tall is a 245/60R18 tire?
29.57 inches, or 751.2 mm overall. That is the 18-inch rim plus a 147 mm sidewall at the top and another at the bottom.
›How many revolutions per mile does 245/60R18 do?
About 682 revolutions per mile, from a rolling circumference of 92.9 inches. Speedometers and odometers are calibrated against this figure, which is why changing size shifts both.
›What tires can replace 245/60R18?
Sizes within 3% of its rolling diameter and one rim step away, such as 235/55R19, 235/60R18, 255/55R18. Each is compared in full below.
Comparing against a size not listed? Open the calculator.