275/50R20 tire size
275/50R20 is a metric size: 30.8" tall, 10.8" wide, on a 20" rim — about a 31x11.00R20. The sidewall is 5.4" and the tire turns 654 times per mile.
275/50R20 specs
| Overall diameter (height) | 30.83" · 783 mm |
|---|---|
| Section width | 10.83" · 275 mm |
| Sidewall height | 5.41" · 138 mm (50% of width) |
| Rim diameter | 20" |
| Circumference | 96.85" · 2.460 m |
| Revolutions per mile | 654 (407 per km) |
| Inch (flotation) equivalent | 31x11.00R20 |
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 | |
|---|---|---|---|---|---|
| 275/55R20 common | 31.91" | +3.51% | 0 mm | 62.1 mph | compare → |
| 255/50R20 common | 30.04" | -2.55% | -20 mm | 58.5 mph | compare → |
| 265/50R20 common | 30.43" | -1.28% | -10 mm | 59.2 mph | compare → |
| 245/50R20 common | 29.65" | -3.83% | -30 mm | 57.7 mph | compare → |
| 275/45R20 common | 29.74" | -3.51% | 0 mm | 57.9 mph | compare → |
| 255/55R20 common | 31.04" | +0.70% | -20 mm | 60.4 mph | compare → |
| 235/55R20 common | 30.18" | -2.11% | -40 mm | 58.7 mph | compare → |
| 265/45R20 common | 29.39" | -4.66% | -10 mm | 57.2 mph | compare → |
| 285/55R20 common | 32.34" | +4.92% | +10 mm | 63.0 mph | compare → |
| 295/40R20 | 29.29" | -4.98% | +20 mm | 57.0 mph | compare → |
| 285/50R20 | 31.22" | +1.28% | +10 mm | 60.8 mph | compare → |
| 245/60R20 | 31.57" | +2.43% | -30 mm | 61.5 mph | compare → |
| 285/45R20 | 30.10" | -2.36% | +10 mm | 58.6 mph | compare → |
| 305/50R20 | 32.01" | +3.83% | +30 mm | 62.3 mph | compare → |
| 295/45R20 | 30.45" | -1.21% | +20 mm | 59.3 mph | compare → |
| 305/40R20 | 29.61" | -3.96% | +30 mm | 57.6 mph | compare → |
| 255/60R20 | 32.05" | +3.96% | -20 mm | 62.4 mph | compare → |
| 235/60R20 | 31.10" | +0.89% | -40 mm | 60.5 mph | calculate → |
| 305/45R20 | 30.81" | -0.06% | +30 mm | 60.0 mph | calculate → |
| 31x18.00R20 | 31.00" | +0.56% | +182 mm | 60.3 mph | calculate → |
| 265/55R20 | 31.48" | +2.11% | -10 mm | 61.3 mph | calculate → |
| 295/50R20 | 31.61" | +2.55% | +20 mm | 61.5 mph | calculate → |
| 175/70R20 | 29.65" | -3.83% | -100 mm | 57.7 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 | |
|---|---|---|---|---|---|
| 255/60R19 common | 31.05" | +0.72% | -20 mm | 60.4 mph | compare → |
| 275/45R21 | 30.74" | -0.27% | 0 mm | 59.8 mph | compare → |
| 285/45R21 | 31.10" | +0.88% | +10 mm | 60.5 mph | compare → |
| 275/55R19 | 30.91" | +0.27% | 0 mm | 60.2 mph | compare → |
| 315/40R21 | 30.92" | +0.31% | +40 mm | 60.2 mph | compare → |
| 255/50R21 | 31.04" | +0.69% | -20 mm | 60.4 mph | compare → |
| 235/65R19 | 31.03" | +0.65% | -40 mm | 60.4 mph | calculate → |
| 305/40R21 | 30.61" | -0.72% | +30 mm | 59.6 mph | calculate → |
| 165/90R19 | 30.69" | -0.43% | -110 mm | 59.7 mph | calculate → |
Try another size against 275/50R20
Questions
What size is 275/50R20 in inches?
275/50R20 is about 30.8" tall and 10.8" wide on a 20-inch rim — roughly a 31x11.00R20 in inch sizing.
What does 275/50R20 mean?
275 mm section width, sidewall 50% of the width (5.41"), radial construction, 20-inch rim.
What tire sizes are equivalent to 275/50R20?
On the same 20" rim, within 3% of the diameter: 305/45R20 (-0.06%), 31x18.00R20 (+0.56%), 255/55R20 (+0.70%), 235/60R20 (+0.89%), 295/45R20 (-1.21%), 265/50R20 (-1.28%).
How many revolutions per mile does a 275/50R20 tire make?
About 654 revolutions per mile (circumference 96.8").
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.