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275/75R18 tire size in inches
275/75R18 is 34.24" tall and 10.83" wide, and fits a 18" rim. In flotation (inch) sizing that is roughly 34.2x10.8R18.
275/75R18 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 34.24" | 870 mm |
| Section width | 10.83" | 275 mm |
| Sidewall height | 8.12" | 206.2 mm |
| Rim diameter | 18" | 457.2 mm |
| Circumference | 107.6" | 2732 mm |
| Revolutions per mile | 589 | |
| Aspect ratio | 75% (sidewall is 75% of the width) | |
Drawn to scale
Among the 122 sizes for 18" wheels on this site, 275/75R18 is #96 by height (shortest: 245/35R18, tallest: 340/80R18).
What people compare 275/75R18 with
Real comparisons drivers search for, worked out against 275/75R18:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/70R18 | -1.08" (-3.15%) | 0.00" | -0.54" | 62 mph |
| 275/65R18 | -2.17" (-6.34%) | 0.00" | -1.08" | 64.1 mph |
275/75R18 against the most popular 18" sizes
| Popular size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 295/70R18 | +0.02" (+0.06%) | +0.78" | +0.01" | 60 mph |
| 285/65R18 | -1.65" (-4.82%) | +0.39" | -0.83" | 63 mph |
| 305/70R18 | +0.57" (+1.66%) | +1.18" | +0.29" | 59 mph |
| 285/70R18 | -0.53" (-1.55%) | +0.39" | -0.27" | 60.9 mph |
| 285/75R18 | +0.59" (+1.72%) | +0.39" | +0.30" | 59 mph |
How the 275/75R18 numbers are worked out
The size code reads as 275 mm section width, 75% aspect ratio, R for radial construction and 18-inch wheel.
- Sidewall = 275 × 75% = 206.2 mm = 8.12"
- Diameter = 18" + 2 × 8.12" = 34.24"
- Circumference = π × 34.24" = 107.6"
- Revs per mile = 63,360" ÷ 107.6" = 589
Sizes that can replace 275/75R18 on a 18" wheel
Within 3% of 34.24". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 295/70R18 | 34.26" | 11.61" | +0.06% | 60 mph |
| 315/65R18 | 34.12" | 12.40" | -0.35% | 60.2 mph |
| 255/80R18 | 34.06" | 10.04" | -0.53% | 60.3 mph |
| 290/70R18 | 33.98" | 11.42" | -0.76% | 60.5 mph |
| 280/75R18 | 34.54" | 11.02" | +0.88% | 59.5 mph |
| 270/75R18 | 33.94" | 10.63" | -0.88% | 60.5 mph |
| 325/65R18 | 34.63" | 12.80" | +1.14% | 59.3 mph |
| 265/80R18 | 34.69" | 10.43" | +1.31% | 59.2 mph |
| 285/70R18 | 33.71" | 11.22" | -1.55% | 60.9 mph |
| 305/70R18 | 34.81" | 12.01" | +1.66% | 59 mph |
| 285/75R18 | 34.83" | 11.22" | +1.72% | 59 mph |
| 265/75R18 | 33.65" | 10.43" | -1.72% | 61.1 mph |
One size wider or narrower
- Narrower: 265/75R18 — 10.43" wide, 33.65" tall
- Wider: 285/75R18 — 11.22" wide, 34.83" tall
Same height on a different wheel size
- 325/75R15 15" (-0.15%)
- 315/75R15 15" (-1.87%)
- 275/85R16 16" (+0.5%)
- 305/75R16 16" (-0.67%)
- 285/80R16 16" (-0.85%)
- 325/70R16 16" (-0.96%)
- 295/80R16 16" (+0.99%)
- 315/75R16 16" (+1.05%)
- 265/85R16 16" (-1.46%)
- 275/80R17 17" (+0.23%)
Questions about 275/75R18
How tall is a 275/75R18 tire in inches?
A 275/75R18 tire is 34.24 inches (870 mm) tall: the 18-inch rim plus two sidewalls of 8.12 inches each.
Is 275/75R18 a 34 inch tire?
Yes. At 34.24 inches tall it is commonly called a 34-inch tire.
How many revolutions per mile does a 275/75R18 make?
About 589 revolutions per mile, based on a calculated circumference of 107.6 inches.
What size can replace 275/75R18?
295/70R18 is the closest match on a 18" rim (+0.06% height). Check load index, speed rating and clearance first.
Compare 275/75R18 against any other size with the tire size calculator.