275/55R20 tire size
275/55R20 is a metric size: 31.9" tall, 10.8" wide, on a 20" rim — about a 32x11.00R20. The sidewall is 6.0" and the tire turns 632 times per mile.
275/55R20 specs
| Overall diameter (height) | 31.91" · 810 mm |
|---|---|
| Section width | 10.83" · 275 mm |
| Sidewall height | 5.95" · 151 mm (55% of width) |
| Rim diameter | 20" |
| Circumference | 100.25" · 2.546 m |
| Revolutions per mile | 632 (393 per km) |
| Inch (flotation) equivalent | 32x11.00R20 |
Equivalent sizes on a 20" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 275/60R20 common | 32.99" | +3.39% | 0 mm | 62.0 mph | compare → |
| 265/50R20 common | 30.43" | -4.63% | -10 mm | 57.2 mph | compare → |
| 255/55R20 common | 31.04" | -2.71% | -20 mm | 58.4 mph | compare → |
| 265/60R20 common | 32.52" | +1.91% | -10 mm | 61.1 mph | compare → |
| 305/55R20 common | 33.21" | +4.07% | +30 mm | 62.4 mph | compare → |
| 285/55R20 common | 32.34" | +1.36% | +10 mm | 60.8 mph | compare → |
| 285/60R20 common | 33.46" | +4.87% | +10 mm | 62.9 mph | compare → |
| 275/50R20 common | 30.83" | -3.39% | 0 mm | 58.0 mph | compare → |
| 33x12.50R20 common | 33.00" | +3.42% | +43 mm | 62.1 mph | compare → |
| 295/55R20 | 32.78" | +2.71% | +20 mm | 61.6 mph | compare → |
| 285/50R20 | 31.22" | -2.16% | +10 mm | 58.7 mph | compare → |
| 245/60R20 | 31.57" | -1.05% | -30 mm | 59.4 mph | compare → |
| 305/50R20 | 32.01" | +0.31% | +30 mm | 60.2 mph | compare → |
| 295/45R20 | 30.45" | -4.57% | +20 mm | 57.3 mph | compare → |
| 255/60R20 | 32.05" | +0.43% | -20 mm | 60.3 mph | compare → |
| 235/60R20 | 31.10" | -2.53% | -40 mm | 58.5 mph | calculate → |
| 33x13.50R20 | 33.00" | +3.42% | +68 mm | 62.1 mph | calculate → |
| 33x11.50R20 | 33.00" | +3.42% | +17 mm | 62.1 mph | calculate → |
| 265/55R20 | 31.48" | -1.36% | -10 mm | 59.2 mph | calculate → |
| 325/50R20 | 32.80" | +2.78% | +50 mm | 61.7 mph | calculate → |
| 31x18.00R20 | 31.00" | -2.85% | +182 mm | 58.3 mph | calculate → |
| 33x12.00R20 | 33.00" | +3.42% | +30 mm | 62.1 mph | calculate → |
| 33x22.00R20 | 33.00" | +3.42% | +284 mm | 62.1 mph | calculate → |
| 305/45R20 | 30.81" | -3.45% | +30 mm | 57.9 mph | calculate → |
| 375/45R20 | 33.29" | +4.32% | +100 mm | 62.6 mph | calculate → |
| 295/50R20 | 31.61" | -0.93% | +20 mm | 59.4 mph | calculate → |
| 315/50R20 | 32.40" | +1.54% | +40 mm | 60.9 mph | calculate → |
| 33x14.50R20 | 33.00" | +3.42% | +93 mm | 62.1 mph | calculate → |
Plus / minus sizing: 19" and 21" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 275/50R21 | 31.83" | -0.26% | 0 mm | 59.8 mph | compare → |
| 255/65R19 | 32.05" | +0.44% | -20 mm | 60.3 mph | calculate → |
| 315/45R21 | 32.16" | +0.79% | +40 mm | 60.5 mph | calculate → |
Try another size against 275/55R20
Questions
What size is 275/55R20 in inches?
275/55R20 is about 31.9" tall and 10.8" wide on a 20-inch rim — roughly a 32x11.00R20 in inch sizing.
What does 275/55R20 mean?
275 mm section width, sidewall 55% of the width (5.95"), radial construction, 20-inch rim.
What tire sizes are equivalent to 275/55R20?
On the same 20" rim, within 3% of the diameter: 305/50R20 (+0.31%), 255/60R20 (+0.43%), 295/50R20 (-0.93%), 245/60R20 (-1.05%), 265/55R20 (-1.36%), 285/55R20 (+1.36%).
How many revolutions per mile does a 275/55R20 tire make?
About 632 revolutions per mile (circumference 100.2").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.