275/30R20 tire size
275/30R20 is a metric size: 26.5" tall, 10.8" wide, on a 20" rim — about a 26.5x11.00R20. The sidewall is 3.2" and the tire turns 761 times per mile.
275/30R20 specs
| Overall diameter (height) | 26.50" · 673 mm |
|---|---|
| Section width | 10.83" · 275 mm |
| Sidewall height | 3.25" · 83 mm (30% of width) |
| Rim diameter | 20" |
| Circumference | 83.24" · 2.114 m |
| Revolutions per mile | 761 (473 per km) |
| Inch (flotation) equivalent | 26.5x11.00R20 |
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 | |
|---|---|---|---|---|---|
| 245/40R20 common | 27.72" | +4.61% | -30 mm | 62.8 mph | compare → |
| 245/35R20 common | 26.75" | +0.97% | -30 mm | 60.6 mph | compare → |
| 255/35R20 common | 27.03" | +2.01% | -20 mm | 61.2 mph | compare → |
| 275/35R20 common | 27.58" | +4.09% | 0 mm | 62.5 mph | compare → |
| 285/30R20 common | 26.73" | +0.89% | +10 mm | 60.5 mph | compare → |
| 265/35R20 common | 27.30" | +3.05% | -10 mm | 61.8 mph | compare → |
| 235/35R20 | 26.48" | -0.07% | -40 mm | 60.0 mph | compare → |
| 295/30R20 | 26.97" | +1.78% | +20 mm | 61.1 mph | compare → |
| 305/30R20 | 27.20" | +2.67% | +30 mm | 61.6 mph | compare → |
| 245/30R20 | 25.79" | -2.67% | -30 mm | 58.4 mph | compare → |
| 265/30R20 | 26.26" | -0.89% | -10 mm | 59.5 mph | compare → |
| 255/30R20 | 26.02" | -1.78% | -20 mm | 58.9 mph | compare → |
| 225/35R20 | 26.20" | -1.11% | -50 mm | 59.3 mph | compare → |
| 335/25R20 | 26.59" | +0.37% | +60 mm | 60.2 mph | compare → |
| 315/30R20 | 27.44" | +3.57% | +40 mm | 62.1 mph | compare → |
| 235/30R20 | 25.55" | -3.57% | -40 mm | 57.9 mph | compare → |
| 305/25R20 | 26.00" | -1.86% | +30 mm | 58.9 mph | compare → |
| 235/40R20 | 27.40" | +3.42% | -40 mm | 62.1 mph | calculate → |
| 295/25R20 | 25.81" | -2.60% | +20 mm | 58.4 mph | calculate → |
| 325/25R20 | 26.40" | -0.37% | +50 mm | 59.8 mph | calculate → |
| 285/25R20 | 25.61" | -3.34% | +10 mm | 58.0 mph | calculate → |
| 325/30R20 | 27.68" | +4.46% | +50 mm | 62.7 mph | calculate → |
| 215/45R20 | 27.62" | +4.23% | -60 mm | 62.5 mph | calculate → |
| 345/25R20 | 26.79" | +1.11% | +70 mm | 60.7 mph | calculate → |
| 225/30R20 | 25.31" | -4.46% | -50 mm | 57.3 mph | calculate → |
| 225/40R20 | 27.09" | +2.23% | -50 mm | 61.3 mph | calculate → |
| 195/50R20 | 27.68" | +4.46% | -80 mm | 62.7 mph | calculate → |
| 145/60R20 | 26.85" | +1.34% | -130 mm | 60.8 mph | calculate → |
| 155/60R20 | 27.32" | +3.12% | -120 mm | 61.9 mph | calculate → |
| 145/65R20 | 27.42" | +3.49% | -130 mm | 62.1 mph | calculate → |
| 175/55R20 | 27.58" | +4.09% | -100 mm | 62.5 mph | calculate → |
| 275/25R20 | 25.41" | -4.09% | 0 mm | 57.5 mph | calculate → |
| 315/25R20 | 26.20" | -1.11% | +40 mm | 59.3 mph | calculate → |
| 165/60R20 | 27.80" | +4.90% | -110 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 | |
|---|---|---|---|---|---|
| 245/40R19 common | 26.72" | +0.83% | -30 mm | 60.5 mph | compare → |
| 235/40R19 common | 26.40" | -0.36% | -40 mm | 59.8 mph | compare → |
| 275/35R19 common | 26.58" | +0.31% | 0 mm | 60.2 mph | compare → |
| 265/35R19 common | 26.30" | -0.73% | -10 mm | 59.6 mph | compare → |
| 325/30R19 | 26.68" | +0.68% | +50 mm | 60.4 mph | compare → |
| 315/30R19 | 26.44" | -0.21% | +40 mm | 59.9 mph | compare → |
| 195/50R19 | 26.68" | +0.68% | -80 mm | 60.4 mph | calculate → |
| 275/25R21 | 26.41" | -0.31% | 0 mm | 59.8 mph | calculate → |
Try another size against 275/30R20
Questions
What size is 275/30R20 in inches?
275/30R20 is about 26.5" tall and 10.8" wide on a 20-inch rim — roughly a 26.5x11.00R20 in inch sizing.
What does 275/30R20 mean?
275 mm section width, sidewall 30% of the width (3.25"), radial construction, 20-inch rim.
What tire sizes are equivalent to 275/30R20?
On the same 20" rim, within 3% of the diameter: 235/35R20 (-0.07%), 325/25R20 (-0.37%), 335/25R20 (+0.37%), 265/30R20 (-0.89%), 285/30R20 (+0.89%), 245/35R20 (+0.97%).
How many revolutions per mile does a 275/30R20 tire make?
About 761 revolutions per mile (circumference 83.2").
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.