Home › 18" tire sizes › 275/70R18
275/70R18 tire size in inches
275/70R18 is 33.16" tall and 10.83" wide, and fits a 18" rim. In flotation (inch) sizing that is roughly 33.2x10.8R18.
275/70R18 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 33.16" | 842 mm |
| Section width | 10.83" | 275 mm |
| Sidewall height | 7.58" | 192.5 mm |
| Rim diameter | 18" | 457.2 mm |
| Circumference | 104.2" | 2646 mm |
| Revolutions per mile | 608 | |
| Aspect ratio | 70% (sidewall is 70% of the width) | |
Drawn to scale
Among the 122 sizes for 18" wheels on this site, 275/70R18 is #86 by height (shortest: 245/35R18, tallest: 340/80R18).
What people compare 275/70R18 with
Real comparisons drivers search for, worked out against 275/70R18:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/65R18 | -1.09" (-3.29%) | 0.00" | -0.54" | 62 mph |
| 285/65R18 | -0.57" (-1.72%) | +0.39" | -0.29" | 61 mph |
| 285/70R18 | +0.55" (+1.66%) | +0.39" | +0.27" | 59 mph |
| 295/70R18 | +1.10" (+3.32%) | +0.78" | +0.55" | 58.1 mph |
| 265/70R18 | -0.55" (-1.66%) | -0.40" | -0.28" | 61 mph |
| 265/65R18 | -1.60" (-4.83%) | -0.40" | -0.80" | 63 mph |
| 285/75R18 | +1.67" (+5.04%) | +0.39" | +0.84" | 57.1 mph |
| 275/65R20 | +0.91" (+2.74%) | 0.00" | -0.54" | 58.4 mph |
How the 275/70R18 numbers are worked out
The size code reads as 275 mm section width, 70% aspect ratio, R for radial construction and 18-inch wheel.
- Sidewall = 275 × 70% = 192.5 mm = 7.58"
- Diameter = 18" + 2 × 7.58" = 33.16"
- Circumference = π × 33.16" = 104.2"
- Revs per mile = 63,360" ÷ 104.2" = 608
Sizes that can replace 275/70R18 on a 18" wheel
Within 3% of 33.16". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 295/65R18 | 33.10" | 11.61" | -0.18% | 60.1 mph |
| 255/75R18 | 33.06" | 10.04" | -0.3% | 60.2 mph |
| 325/60R18 | 33.35" | 12.80" | +0.57% | 59.7 mph |
| 280/70R18 | 33.43" | 11.02" | +0.81% | 59.5 mph |
| 270/70R18 | 32.88" | 10.63" | -0.84% | 60.5 mph |
| 315/60R18 | 32.88" | 12.40" | -0.84% | 60.5 mph |
| 235/80R18 | 32.80" | 9.25" | -1.09% | 60.7 mph |
| 375/50R18 | 32.76" | 14.76" | -1.21% | 60.7 mph |
| 305/65R18 | 33.61" | 12.01" | +1.36% | 59.2 mph |
| 265/75R18 | 33.65" | 10.43" | +1.48% | 59.1 mph |
| 285/70R18 | 33.71" | 11.22" | +1.66% | 59 mph |
| 265/70R18 | 32.61" | 10.43" | -1.66% | 61 mph |
One size wider or narrower
Same height on a different wheel size
- 305/75R15 15" (-0.45%)
- 265/85R15 15" (-1.27%)
- 315/75R15 15" (+1.33%)
- 255/85R16 16" (-0.27%)
- 275/80R16 16" (+0.48%)
- 315/70R16 16" (+0.6%)
- 295/75R16 16" (+0.78%)
- 285/75R16 16" (-1%)
- 305/70R16 16" (-1.06%)
- 265/80R16 16" (-1.42%)
Questions about 275/70R18
How tall is a 275/70R18 tire in inches?
A 275/70R18 tire is 33.16 inches (842 mm) tall: the 18-inch rim plus two sidewalls of 7.58 inches each.
Is 275/70R18 a 33 inch tire?
Yes. At 33.16 inches tall it is commonly called a 33-inch tire.
How many revolutions per mile does a 275/70R18 make?
About 608 revolutions per mile, based on a calculated circumference of 104.2 inches.
What size can replace 275/70R18?
295/65R18 is the closest match on a 18" rim (-0.18% height). Check load index, speed rating and clearance first.
Compare 275/70R18 against any other size with the tire size calculator.