225/45R20 tire size
225/45R20 is a metric size: 28.0" tall, 8.9" wide, on a 20" rim — about a 28x9.00R20. The sidewall is 4.0" and the tire turns 721 times per mile.
225/45R20 specs
| Overall diameter (height) | 27.97" · 710 mm |
|---|---|
| Section width | 8.86" · 225 mm |
| Sidewall height | 3.99" · 101 mm (45% of width) |
| Rim diameter | 20" |
| Circumference | 87.88" · 2.232 m |
| Revolutions per mile | 721 (448 per km) |
| Inch (flotation) equivalent | 28x9.00R20 |
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" | +2.53% | +20 mm | 61.5 mph | calculate → |
| 255/45R20 common | 29.04" | +3.80% | +30 mm | 62.3 mph | calculate → |
| 275/40R20 common | 28.66" | +2.46% | +50 mm | 61.5 mph | calculate → |
| 245/40R20 common | 27.72" | -0.91% | +20 mm | 59.5 mph | calculate → |
| 245/35R20 common | 26.75" | -4.36% | +20 mm | 57.4 mph | calculate → |
| 255/35R20 common | 27.03" | -3.38% | +30 mm | 58.0 mph | calculate → |
| 255/40R20 common | 28.03" | +0.21% | +30 mm | 60.1 mph | calculate → |
| 275/35R20 common | 27.58" | -1.41% | +50 mm | 59.2 mph | calculate → |
| 285/35R20 common | 27.85" | -0.42% | +60 mm | 59.7 mph | calculate → |
| 315/35R20 common | 28.68" | +2.53% | +90 mm | 61.5 mph | calculate → |
| 285/30R20 common | 26.73" | -4.43% | +60 mm | 57.3 mph | calculate → |
| 265/35R20 common | 27.30" | -2.39% | +40 mm | 58.6 mph | calculate → |
| 295/30R20 | 26.97" | -3.59% | +70 mm | 57.8 mph | calculate → |
| 305/30R20 | 27.20" | -2.74% | +80 mm | 58.4 mph | calculate → |
| 295/40R20 | 29.29" | +4.71% | +70 mm | 62.8 mph | calculate → |
| 295/35R20 | 28.13" | +0.56% | +70 mm | 60.3 mph | calculate → |
| 305/35R20 | 28.41" | +1.55% | +80 mm | 60.9 mph | calculate → |
| 285/40R20 | 28.98" | +3.59% | +60 mm | 62.2 mph | calculate → |
| 235/50R20 | 29.25" | +4.57% | +10 mm | 62.7 mph | calculate → |
| 235/45R20 | 28.33" | +1.27% | +10 mm | 60.8 mph | calculate → |
| 265/40R20 | 28.35" | +1.34% | +40 mm | 60.8 mph | calculate → |
| 335/25R20 | 26.59" | -4.93% | +110 mm | 57.0 mph | calculate → |
| 315/30R20 | 27.44" | -1.90% | +90 mm | 58.9 mph | calculate → |
| 235/40R20 | 27.40" | -2.04% | +10 mm | 58.8 mph | calculate → |
| 335/30R20 | 27.91" | -0.21% | +110 mm | 59.9 mph | calculate → |
| 325/30R20 | 27.68" | -1.06% | +100 mm | 59.4 mph | calculate → |
| 345/30R20 | 28.15" | +0.63% | +120 mm | 60.4 mph | calculate → |
| 215/45R20 | 27.62" | -1.27% | -10 mm | 59.2 mph | calculate → |
| 345/25R20 | 26.79" | -4.22% | +120 mm | 57.5 mph | calculate → |
| 195/50R20 | 27.68" | -1.06% | -30 mm | 59.4 mph | calculate → |
| 225/40R20 | 27.09" | -3.17% | 0 mm | 58.1 mph | calculate → |
| 325/35R20 | 28.96" | +3.52% | +100 mm | 62.1 mph | calculate → |
| 175/55R20 | 27.58" | -1.41% | -50 mm | 59.2 mph | calculate → |
| 145/65R20 | 27.42" | -1.97% | -80 mm | 58.8 mph | calculate → |
| 155/60R20 | 27.32" | -2.32% | -70 mm | 58.6 mph | calculate → |
| 29x15.00R20 | 29.00" | +3.67% | +156 mm | 62.2 mph | calculate → |
| 29x18.00R20 | 29.00" | +3.67% | +232 mm | 62.2 mph | calculate → |
| 145/60R20 | 26.85" | -4.01% | -80 mm | 57.6 mph | calculate → |
| 155/65R20 | 27.93" | -0.14% | -70 mm | 59.9 mph | calculate → |
| 165/60R20 | 27.80" | -0.63% | -60 mm | 59.6 mph | calculate → |
| 195/55R20 | 28.44" | +1.69% | -30 mm | 61.0 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 | |
|---|---|---|---|---|---|
| 255/45R19 common | 28.04" | +0.23% | +30 mm | 60.1 mph | calculate → |
| 235/50R19 common | 28.25" | +1.00% | +10 mm | 60.6 mph | calculate → |
| 245/35R21 | 27.75" | -0.79% | +20 mm | 59.5 mph | calculate → |
| 285/40R19 | 27.98" | +0.01% | +60 mm | 60.0 mph | calculate → |
| 255/35R21 | 28.03" | +0.20% | +30 mm | 60.1 mph | calculate → |
| 295/30R21 | 27.97" | -0.01% | +70 mm | 60.0 mph | calculate → |
| 305/30R21 | 28.20" | +0.83% | +80 mm | 60.5 mph | calculate → |
| 285/30R21 | 27.73" | -0.86% | +60 mm | 59.5 mph | calculate → |
| 355/25R21 | 27.99" | +0.06% | +130 mm | 60.0 mph | calculate → |
| 345/25R21 | 27.79" | -0.65% | +120 mm | 59.6 mph | calculate → |
| 225/50R19 | 27.86" | -0.41% | 0 mm | 59.8 mph | calculate → |
| 145/80R19 | 28.13" | +0.58% | -80 mm | 60.3 mph | calculate → |
Try another size against 225/45R20
Questions
What size is 225/45R20 in inches?
225/45R20 is about 28.0" tall and 8.9" wide on a 20-inch rim — roughly a 28x9.00R20 in inch sizing.
What does 225/45R20 mean?
225 mm section width, sidewall 45% of the width (3.99"), radial construction, 20-inch rim.
What tire sizes are equivalent to 225/45R20?
On the same 20" rim, within 3% of the diameter: 155/65R20 (-0.14%), 255/40R20 (+0.21%), 335/30R20 (-0.21%), 285/35R20 (-0.42%), 295/35R20 (+0.56%), 165/60R20 (-0.63%).
How many revolutions per mile does a 225/45R20 tire make?
About 721 revolutions per mile (circumference 87.9").
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.