Home › 20" tire sizes › 275/55R20
275/55R20 tire size in inches
275/55R20 is 31.91" tall and 10.83" wide, and fits a 20" rim. In flotation (inch) sizing that is roughly 31.9x10.8R20.
275/55R20 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 31.91" | 811 mm |
| Section width | 10.83" | 275 mm |
| Sidewall height | 5.95" | 151.2 mm |
| Rim diameter | 20" | 508.0 mm |
| Circumference | 100.3" | 2546 mm |
| Revolutions per mile | 632 | |
| Aspect ratio | 55% (sidewall is 55% of the width) | |
Drawn to scale
Among the 131 sizes for 20" wheels on this site, 275/55R20 is #59 by height (shortest: 225/30R20, tallest: 365/85R20).
What people compare 275/55R20 with
Real comparisons drivers search for, worked out against 275/55R20:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/60R20 | +1.08" (+3.38%) | 0.00" | +0.55" | 58 mph |
| 275/65R20 | +2.16" (+6.77%) | 0.00" | +1.09" | 56.2 mph |
| 285/55R20 | +0.43" (+1.35%) | +0.39" | +0.22" | 59.2 mph |
| 265/60R20 | +0.61" (+1.91%) | -0.40" | +0.31" | 58.9 mph |
| 265/50R20 | -1.48" (-4.64%) | -0.40" | -0.73" | 62.9 mph |
| 285/50R20 | -0.69" (-2.16%) | +0.39" | -0.34" | 61.3 mph |
| 305/55R20 | +1.30" (+4.07%) | +1.18" | +0.65" | 57.7 mph |
| 275/65R18 | +0.16" (+0.5%) | 0.00" | +1.09" | 59.7 mph |
How the 275/55R20 numbers are worked out
The size code reads as 275 mm section width, 55% aspect ratio, R for radial construction and 20-inch wheel.
- Sidewall = 275 × 55% = 151.2 mm = 5.95"
- Diameter = 20" + 2 × 5.95" = 31.91"
- Circumference = π × 31.91" = 100.3"
- Revs per mile = 63,360" ÷ 100.3" = 632
Sizes that can replace 275/55R20 on a 20" wheel
Within 3% of 31.91". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 305/50R20 | 32.01" | 12.01" | +0.31% | 59.8 mph |
| 235/65R20 | 32.03" | 9.25" | +0.38% | 59.8 mph |
| 255/60R20 | 32.05" | 10.04" | +0.44% | 59.7 mph |
| 270/55R20 | 31.69" | 10.63" | -0.69% | 60.4 mph |
| 295/50R20 | 31.61" | 11.61" | -0.94% | 60.6 mph |
| 245/60R20 | 31.57" | 9.65" | -1.07% | 60.6 mph |
| 260/60R20 | 32.28" | 10.24" | +1.16% | 59.3 mph |
| 325/45R20 | 31.52" | 12.80" | -1.22% | 60.7 mph |
| 285/55R20 | 32.34" | 11.22" | +1.35% | 59.2 mph |
| 265/55R20 | 31.48" | 10.43" | -1.35% | 60.8 mph |
| 315/50R20 | 32.40" | 12.40" | +1.54% | 59.1 mph |
| 265/60R20 | 32.52" | 10.43" | +1.91% | 58.9 mph |
One size wider or narrower
Same height on a different wheel size
- 285/75R15 15" (-0.25%)
- 305/70R15 15" (-0.31%)
- 255/85R15 15" (+0.5%)
- 265/80R15 15" (-0.69%)
- 315/70R15 15" (+1.41%)
- 295/75R15 15" (+1.6%)
- 245/85R15 15" (-1.6%)
- 270/75R16 16" (+0.09%)
- 255/80R16 16" (+0.47%)
- 235/85R16 16" (-0.56%)
Questions about 275/55R20
How tall is a 275/55R20 tire in inches?
A 275/55R20 tire is 31.91 inches (811 mm) tall: the 20-inch rim plus two sidewalls of 5.95 inches each.
Is 275/55R20 a 32 inch tire?
Yes. At 31.91 inches tall it is commonly called a 32-inch tire.
How many revolutions per mile does a 275/55R20 make?
About 632 revolutions per mile, based on a calculated circumference of 100.3 inches.
What size can replace 275/55R20?
305/50R20 is the closest match on a 20" rim (+0.31% height). Check load index, speed rating and clearance first.
Compare 275/55R20 against any other size with the tire size calculator.