Home › 18" tire sizes › 275/65R18
275/65R18 tire size in inches
275/65R18 is 32.07" tall and 10.83" wide, and fits a 18" rim. In flotation (inch) sizing that is roughly 32.1x10.8R18.
275/65R18 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 32.07" | 815 mm |
| Section width | 10.83" | 275 mm |
| Sidewall height | 7.04" | 178.8 mm |
| Rim diameter | 18" | 457.2 mm |
| Circumference | 100.8" | 2560 mm |
| Revolutions per mile | 629 | |
| Aspect ratio | 65% (sidewall is 65% of the width) | |
Drawn to scale
Among the 122 sizes for 18" wheels on this site, 275/65R18 is #73 by height (shortest: 245/35R18, tallest: 340/80R18).
What people compare 275/65R18 with
Real comparisons drivers search for, worked out against 275/65R18:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/70R18 | +1.09" (+3.4%) | 0.00" | +0.54" | 58 mph |
| 265/70R18 | +0.54" (+1.68%) | -0.40" | +0.26" | 59 mph |
| 265/65R18 | -0.51" (-1.59%) | -0.40" | -0.26" | 61 mph |
| 285/65R18 | +0.52" (+1.62%) | +0.39" | +0.25" | 59 mph |
| 255/70R18 | -0.01" (-0.03%) | -0.79" | -0.01" | 60 mph |
| 265/60R18 | -1.55" (-4.83%) | -0.40" | -0.78" | 63 mph |
| 265/70R17 | -0.46" (-1.43%) | -0.40" | +0.26" | 60.9 mph |
| 295/70R18 | +2.19" (+6.83%) | +0.78" | +1.09" | 56.2 mph |
How the 275/65R18 numbers are worked out
The size code reads as 275 mm section width, 65% aspect ratio, R for radial construction and 18-inch wheel.
- Sidewall = 275 × 65% = 178.8 mm = 7.04"
- Diameter = 18" + 2 × 7.04" = 32.07"
- Circumference = π × 32.07" = 100.8"
- Revs per mile = 63,360" ÷ 100.8" = 629
Sizes that can replace 275/65R18 on a 18" wheel
Within 3% of 32.07". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 325/55R18 | 32.07" | 12.80" | 0% | 60 mph |
| 255/70R18 | 32.06" | 10.04" | -0.03% | 60 mph |
| 295/60R18 | 31.94" | 11.61" | -0.41% | 60.2 mph |
| 235/75R18 | 31.88" | 9.25" | -0.59% | 60.4 mph |
| 270/65R18 | 31.82" | 10.63" | -0.78% | 60.5 mph |
| 280/65R18 | 32.33" | 11.02" | +0.81% | 59.5 mph |
| 305/60R18 | 32.41" | 12.01" | +1.06% | 59.4 mph |
| 245/75R18 | 32.47" | 9.65" | +1.25% | 59.3 mph |
| 265/65R18 | 31.56" | 10.43" | -1.59% | 61 mph |
| 285/65R18 | 32.59" | 11.22" | +1.62% | 59 mph |
| 265/70R18 | 32.61" | 10.43" | +1.68% | 59 mph |
| 245/70R18 | 31.50" | 9.65" | -1.78% | 61.1 mph |
One size wider or narrower
Same height on a different wheel size
- 255/85R15 15" (0%)
- 285/75R15 15" (-0.75%)
- 305/70R15 15" (-0.81%)
- 315/70R15 15" (+0.9%)
- 295/75R15 15" (+1.09%)
- 265/80R15 15" (-1.18%)
- 255/80R16 16" (-0.03%)
- 315/65R16 16" (+0.16%)
- 270/75R16 16" (-0.41%)
- 275/75R16 16" (+0.53%)
Questions about 275/65R18
How tall is a 275/65R18 tire in inches?
A 275/65R18 tire is 32.07 inches (815 mm) tall: the 18-inch rim plus two sidewalls of 7.04 inches each.
Is 275/65R18 a 32 inch tire?
Yes. At 32.07 inches tall it is commonly called a 32-inch tire.
How many revolutions per mile does a 275/65R18 make?
About 629 revolutions per mile, based on a calculated circumference of 100.8 inches.
What size can replace 275/65R18?
325/55R18 is the closest match on a 18" rim (0% height). Check load index, speed rating and clearance first.
Compare 275/65R18 against any other size with the tire size calculator.