325/30R20 tire size
325/30R20 is a metric size: 27.7" tall, 12.8" wide, on a 20" rim — about a 27.5x13.00R20. The sidewall is 3.8" and the tire turns 729 times per mile.
325/30R20 specs
| Overall diameter (height) | 27.68" · 703 mm |
|---|---|
| Section width | 12.80" · 325 mm |
| Sidewall height | 3.84" · 98 mm (30% of width) |
| Rim diameter | 20" |
| Circumference | 86.95" · 2.209 m |
| Revolutions per mile | 729 (453 per km) |
| Inch (flotation) equivalent | 27.5x13.00R20 |
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 | |
|---|---|---|---|---|---|
| 245/45R20 common | 28.68" | +3.63% | -80 mm | 62.2 mph | calculate → |
| 255/45R20 common | 29.04" | +4.91% | -70 mm | 62.9 mph | calculate → |
| 275/40R20 common | 28.66" | +3.56% | -50 mm | 62.1 mph | calculate → |
| 245/40R20 common | 27.72" | +0.14% | -80 mm | 60.1 mph | calculate → |
| 245/35R20 common | 26.75" | -3.34% | -80 mm | 58.0 mph | calculate → |
| 255/35R20 common | 27.03" | -2.35% | -70 mm | 58.6 mph | calculate → |
| 275/35R20 common | 27.58" | -0.36% | -50 mm | 59.8 mph | calculate → |
| 255/40R20 common | 28.03" | +1.28% | -70 mm | 60.8 mph | calculate → |
| 285/35R20 common | 27.85" | +0.64% | -40 mm | 60.4 mph | calculate → |
| 315/35R20 common | 28.68" | +3.63% | -10 mm | 62.2 mph | calculate → |
| 285/30R20 common | 26.73" | -3.41% | -40 mm | 58.0 mph | calculate → |
| 275/30R20 common | 26.50" | -4.27% | -50 mm | 57.4 mph | calculate → |
| 265/35R20 common | 27.30" | -1.35% | -60 mm | 59.2 mph | calculate → |
| 235/35R20 | 26.48" | -4.34% | -90 mm | 57.4 mph | calculate → |
| 295/30R20 | 26.97" | -2.56% | -30 mm | 58.5 mph | calculate → |
| 305/30R20 | 27.20" | -1.71% | -20 mm | 59.0 mph | calculate → |
| 295/35R20 | 28.13" | +1.64% | -30 mm | 61.0 mph | calculate → |
| 305/35R20 | 28.41" | +2.63% | -20 mm | 61.6 mph | calculate → |
| 285/40R20 | 28.98" | +4.69% | -40 mm | 62.8 mph | calculate → |
| 235/45R20 | 28.33" | +2.35% | -90 mm | 61.4 mph | calculate → |
| 265/40R20 | 28.35" | +2.42% | -60 mm | 61.5 mph | calculate → |
| 335/25R20 | 26.59" | -3.91% | +10 mm | 57.7 mph | calculate → |
| 315/30R20 | 27.44" | -0.85% | -10 mm | 59.5 mph | calculate → |
| 235/40R20 | 27.40" | -1.00% | -90 mm | 59.4 mph | calculate → |
| 335/30R20 | 27.91" | +0.85% | +10 mm | 60.5 mph | calculate → |
| 325/25R20 | 26.40" | -4.62% | 0 mm | 57.2 mph | calculate → |
| 345/30R20 | 28.15" | +1.71% | +20 mm | 61.0 mph | calculate → |
| 215/45R20 | 27.62" | -0.21% | -110 mm | 59.9 mph | calculate → |
| 345/25R20 | 26.79" | -3.20% | +20 mm | 58.1 mph | calculate → |
| 195/50R20 | 27.68" | 0.00% | -130 mm | 60.0 mph | calculate → |
| 225/40R20 | 27.09" | -2.13% | -100 mm | 58.7 mph | calculate → |
| 325/35R20 | 28.96" | +4.62% | 0 mm | 62.8 mph | calculate → |
| 175/55R20 | 27.58" | -0.36% | -150 mm | 59.8 mph | calculate → |
| 145/65R20 | 27.42" | -0.92% | -180 mm | 59.4 mph | calculate → |
| 155/60R20 | 27.32" | -1.28% | -170 mm | 59.2 mph | calculate → |
| 145/60R20 | 26.85" | -2.99% | -180 mm | 58.2 mph | calculate → |
| 29x15.00R20 | 29.00" | +4.78% | +56 mm | 62.9 mph | calculate → |
| 29x18.00R20 | 29.00" | +4.78% | +132 mm | 62.9 mph | calculate → |
| 165/60R20 | 27.80" | +0.43% | -160 mm | 60.3 mph | calculate → |
| 155/65R20 | 27.93" | +0.92% | -170 mm | 60.6 mph | calculate → |
| 225/45R20 | 27.97" | +1.07% | -100 mm | 60.6 mph | calculate → |
| 195/55R20 | 28.44" | +2.77% | -130 mm | 61.7 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 | |
|---|---|---|---|---|---|
| 245/45R19 common | 27.68" | +0.01% | -80 mm | 60.0 mph | calculate → |
| 275/40R19 common | 27.66" | -0.06% | -50 mm | 60.0 mph | calculate → |
| 245/35R21 | 27.75" | +0.27% | -80 mm | 60.2 mph | calculate → |
| 285/30R21 | 27.73" | +0.20% | -40 mm | 60.1 mph | calculate → |
| 275/30R21 | 27.50" | -0.65% | -50 mm | 59.6 mph | calculate → |
| 305/35R19 | 27.41" | -0.98% | -20 mm | 59.4 mph | calculate → |
| 155/70R19 | 27.54" | -0.48% | -170 mm | 59.7 mph | calculate → |
| 345/25R21 | 27.79" | +0.41% | +20 mm | 60.2 mph | calculate → |
| 215/50R19 | 27.46" | -0.77% | -110 mm | 59.5 mph | calculate → |
| 315/35R19 | 27.68" | +0.01% | -10 mm | 60.0 mph | calculate → |
| 225/50R19 | 27.86" | +0.65% | -100 mm | 60.4 mph | calculate → |
Try another size against 325/30R20
Questions
What size is 325/30R20 in inches?
325/30R20 is about 27.7" tall and 12.8" wide on a 20-inch rim — roughly a 27.5x13.00R20 in inch sizing.
What does 325/30R20 mean?
325 mm section width, sidewall 30% of the width (3.84"), radial construction, 20-inch rim.
What tire sizes are equivalent to 325/30R20?
On the same 20" rim, within 3% of the diameter: 195/50R20 (0.00%), 245/40R20 (+0.14%), 215/45R20 (-0.21%), 175/55R20 (-0.36%), 275/35R20 (-0.36%), 165/60R20 (+0.43%).
How many revolutions per mile does a 325/30R20 tire make?
About 729 revolutions per mile (circumference 87.0").
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.