265/55R20 tire size
265/55R20 is a metric size: 31.5" tall, 10.4" wide, on a 20" rim — about a 31.5x10.50R20. The sidewall is 5.7" and the tire turns 641 times per mile.
265/55R20 specs
| Overall diameter (height) | 31.48" · 799 mm |
|---|---|
| Section width | 10.43" · 265 mm |
| Sidewall height | 5.74" · 146 mm (55% of width) |
| Rim diameter | 20" |
| Circumference | 98.89" · 2.512 m |
| Revolutions per mile | 641 (398 per km) |
| Inch (flotation) equivalent | 31.5x10.50R20 |
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 | |
|---|---|---|---|---|---|
| 275/55R20 common | 31.91" | +1.38% | +10 mm | 60.8 mph | calculate → |
| 275/60R20 common | 32.99" | +4.82% | +10 mm | 62.9 mph | calculate → |
| 255/50R20 common | 30.04" | -4.57% | -10 mm | 57.3 mph | calculate → |
| 265/50R20 common | 30.43" | -3.31% | 0 mm | 58.0 mph | calculate → |
| 255/55R20 common | 31.04" | -1.38% | -10 mm | 59.2 mph | calculate → |
| 235/55R20 common | 30.18" | -4.13% | -30 mm | 57.5 mph | calculate → |
| 265/60R20 common | 32.52" | +3.31% | 0 mm | 62.0 mph | calculate → |
| 285/55R20 common | 32.34" | +2.75% | +20 mm | 61.7 mph | calculate → |
| 275/50R20 common | 30.83" | -2.06% | +10 mm | 58.8 mph | calculate → |
| 33x12.50R20 common | 33.00" | +4.84% | +53 mm | 62.9 mph | calculate → |
| 295/55R20 | 32.78" | +4.13% | +30 mm | 62.5 mph | calculate → |
| 285/50R20 | 31.22" | -0.81% | +20 mm | 59.5 mph | calculate → |
| 245/60R20 | 31.57" | +0.31% | -20 mm | 60.2 mph | calculate → |
| 305/50R20 | 32.01" | +1.69% | +40 mm | 61.0 mph | calculate → |
| 285/45R20 | 30.10" | -4.38% | +20 mm | 57.4 mph | calculate → |
| 295/45R20 | 30.45" | -3.25% | +30 mm | 58.0 mph | calculate → |
| 255/60R20 | 32.05" | +1.81% | -10 mm | 61.1 mph | calculate → |
| 235/60R20 | 31.10" | -1.19% | -30 mm | 59.3 mph | calculate → |
| 33x13.50R20 | 33.00" | +4.84% | +78 mm | 62.9 mph | calculate → |
| 33x11.50R20 | 33.00" | +4.84% | +27 mm | 62.9 mph | calculate → |
| 31x18.00R20 | 31.00" | -1.51% | +192 mm | 59.1 mph | calculate → |
| 305/45R20 | 30.81" | -2.13% | +40 mm | 58.7 mph | calculate → |
| 325/50R20 | 32.80" | +4.19% | +60 mm | 62.5 mph | calculate → |
| 33x12.00R20 | 33.00" | +4.84% | +40 mm | 62.9 mph | calculate → |
| 33x22.00R20 | 33.00" | +4.84% | +294 mm | 62.9 mph | calculate → |
| 295/50R20 | 31.61" | +0.44% | +30 mm | 60.3 mph | calculate → |
| 315/50R20 | 32.40" | +2.94% | +50 mm | 61.8 mph | calculate → |
| 33x14.50R20 | 33.00" | +4.84% | +103 mm | 62.9 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 | |
|---|---|---|---|---|---|
| 325/40R21 | 31.24" | -0.76% | +60 mm | 59.5 mph | calculate → |
Try another size against 265/55R20
Questions
What size is 265/55R20 in inches?
265/55R20 is about 31.5" tall and 10.4" wide on a 20-inch rim — roughly a 31.5x10.50R20 in inch sizing.
What does 265/55R20 mean?
265 mm section width, sidewall 55% of the width (5.74"), radial construction, 20-inch rim.
What tire sizes are equivalent to 265/55R20?
On the same 20" rim, within 3% of the diameter: 245/60R20 (+0.31%), 295/50R20 (+0.44%), 285/50R20 (-0.81%), 235/60R20 (-1.19%), 255/55R20 (-1.38%), 275/55R20 (+1.38%).
How many revolutions per mile does a 265/55R20 tire make?
About 641 revolutions per mile (circumference 98.9").
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.