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275/60R18 tire size in inches
275/60R18 is 30.99" tall and 10.83" wide, and fits a 18" rim. In flotation (inch) sizing that is roughly 31.0x10.8R18.
275/60R18 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 30.99" | 787 mm |
| Section width | 10.83" | 275 mm |
| Sidewall height | 6.50" | 165.0 mm |
| Rim diameter | 18" | 457.2 mm |
| Circumference | 97.4" | 2473 mm |
| Revolutions per mile | 651 | |
| Aspect ratio | 60% (sidewall is 60% of the width) | |
Drawn to scale
Among the 122 sizes for 18" wheels on this site, 275/60R18 is #63 by height (shortest: 245/35R18, tallest: 340/80R18).
What people compare 275/60R18 with
Real comparisons drivers search for, worked out against 275/60R18:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 265/60R18 | -0.47" (-1.52%) | -0.40" | -0.24" | 60.9 mph |
| 275/65R18 | +1.08" (+3.48%) | 0.00" | +0.54" | 58 mph |
275/60R18 against the most popular 18" sizes
| Popular size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/70R18 | +2.17" (+7%) | 0.00" | +1.08" | 56.1 mph |
| 295/70R18 | +3.27" (+10.55%) | +0.78" | +1.63" | 54.3 mph |
| 285/65R18 | +1.60" (+5.16%) | +0.39" | +0.79" | 57.1 mph |
| 305/70R18 | +3.82" (+12.33%) | +1.18" | +1.91" | 53.4 mph |
| 285/70R18 | +2.72" (+8.78%) | +0.39" | +1.35" | 55.2 mph |
How the 275/60R18 numbers are worked out
The size code reads as 275 mm section width, 60% aspect ratio, R for radial construction and 18-inch wheel.
- Sidewall = 275 × 60% = 165.0 mm = 6.50"
- Diameter = 18" + 2 × 6.50" = 30.99"
- Circumference = π × 30.99" = 97.4"
- Revs per mile = 63,360" ÷ 97.4" = 651
Sizes that can replace 275/60R18 on a 18" wheel
Within 3% of 30.99". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 235/70R18 | 30.95" | 9.25" | -0.13% | 60.1 mph |
| 255/65R18 | 31.05" | 10.04" | +0.19% | 59.9 mph |
| 295/55R18 | 30.78" | 11.61" | -0.68% | 60.4 mph |
| 305/55R18 | 31.21" | 12.01" | +0.71% | 59.6 mph |
| 245/65R18 | 30.54" | 9.65" | -1.45% | 60.9 mph |
| 265/60R18 | 30.52" | 10.43" | -1.52% | 60.9 mph |
| 285/60R18 | 31.46" | 11.22" | +1.52% | 59.1 mph |
| 245/70R18 | 31.50" | 9.65" | +1.65% | 59 mph |
| 265/65R18 | 31.56" | 10.43" | +1.84% | 58.9 mph |
| 225/70R18 | 30.40" | 8.86" | -1.9% | 61.2 mph |
| 285/55R18 | 30.34" | 11.22" | -2.1% | 61.3 mph |
| 260/60R18 | 30.28" | 10.24" | -2.29% | 61.4 mph |
One size wider or narrower
Same height on a different wheel size
- 255/80R15 15" (+0.23%)
- 275/75R15 15" (+0.81%)
- 235/85R15 15" (-0.84%)
- 295/70R15 15" (+0.87%)
- 285/70R15 15" (-0.9%)
- 265/75R15 15" (-1.1%)
- 245/85R15 15" (+1.32%)
- 255/75R16 16" (+0.23%)
- 225/85R16 16" (+0.23%)
- 270/70R16 16" (-0.35%)
Questions about 275/60R18
How tall is a 275/60R18 tire in inches?
A 275/60R18 tire is 30.99 inches (787 mm) tall: the 18-inch rim plus two sidewalls of 6.50 inches each.
Is 275/60R18 a 31 inch tire?
Yes. At 30.99 inches tall it is commonly called a 31-inch tire.
How many revolutions per mile does a 275/60R18 make?
About 651 revolutions per mile, based on a calculated circumference of 97.4 inches.
What size can replace 275/60R18?
235/70R18 is the closest match on a 18" rim (-0.13% height). Check load index, speed rating and clearance first.
Compare 275/60R18 against any other size with the tire size calculator.