145/60R20 tire size
145/60R20 is a metric size: 26.9" tall, 5.7" wide, on a 20" rim — about a 27x5.50R20. The sidewall is 3.4" and the tire turns 751 times per mile.
145/60R20 specs
| Overall diameter (height) | 26.85" · 682 mm |
|---|---|
| Section width | 5.71" · 145 mm |
| Sidewall height | 3.43" · 87 mm (60% of width) |
| Rim diameter | 20" |
| Circumference | 84.35" · 2.143 m |
| Revolutions per mile | 751 (467 per km) |
| Inch (flotation) equivalent | 27x5.50R20 |
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 | |
|---|---|---|---|---|---|
| 245/40R20 common | 27.72" | +3.23% | +100 mm | 61.9 mph | calculate → |
| 245/35R20 common | 26.75" | -0.37% | +100 mm | 59.8 mph | calculate → |
| 255/35R20 common | 27.03" | +0.66% | +110 mm | 60.4 mph | calculate → |
| 275/35R20 common | 27.58" | +2.71% | +130 mm | 61.6 mph | calculate → |
| 255/40R20 common | 28.03" | +4.40% | +110 mm | 62.6 mph | calculate → |
| 285/35R20 common | 27.85" | +3.74% | +140 mm | 62.2 mph | calculate → |
| 285/30R20 common | 26.73" | -0.44% | +140 mm | 59.7 mph | calculate → |
| 275/30R20 common | 26.50" | -1.32% | +130 mm | 59.2 mph | calculate → |
| 265/35R20 common | 27.30" | +1.69% | +120 mm | 61.0 mph | calculate → |
| 235/35R20 | 26.48" | -1.39% | +90 mm | 59.2 mph | calculate → |
| 295/30R20 | 26.97" | +0.44% | +150 mm | 60.3 mph | calculate → |
| 305/30R20 | 27.20" | +1.32% | +160 mm | 60.8 mph | calculate → |
| 295/35R20 | 28.13" | +4.77% | +150 mm | 62.9 mph | calculate → |
| 245/30R20 | 25.79" | -3.96% | +100 mm | 57.6 mph | calculate → |
| 265/30R20 | 26.26" | -2.20% | +120 mm | 58.7 mph | calculate → |
| 255/30R20 | 26.02" | -3.08% | +110 mm | 58.2 mph | calculate → |
| 225/35R20 | 26.20" | -2.42% | +80 mm | 58.5 mph | calculate → |
| 335/25R20 | 26.59" | -0.95% | +190 mm | 59.4 mph | calculate → |
| 315/30R20 | 27.44" | +2.20% | +170 mm | 61.3 mph | calculate → |
| 235/30R20 | 25.55" | -4.84% | +90 mm | 57.1 mph | calculate → |
| 305/25R20 | 26.00" | -3.15% | +160 mm | 58.1 mph | calculate → |
| 235/40R20 | 27.40" | +2.05% | +90 mm | 61.2 mph | calculate → |
| 295/25R20 | 25.81" | -3.89% | +150 mm | 57.7 mph | calculate → |
| 335/30R20 | 27.91" | +3.96% | +190 mm | 62.4 mph | calculate → |
| 325/25R20 | 26.40" | -1.69% | +180 mm | 59.0 mph | calculate → |
| 325/30R20 | 27.68" | +3.08% | +180 mm | 61.8 mph | calculate → |
| 285/25R20 | 25.61" | -4.62% | +140 mm | 57.2 mph | calculate → |
| 345/30R20 | 28.15" | +4.84% | +200 mm | 62.9 mph | calculate → |
| 215/45R20 | 27.62" | +2.86% | +70 mm | 61.7 mph | calculate → |
| 345/25R20 | 26.79" | -0.22% | +200 mm | 59.9 mph | calculate → |
| 225/40R20 | 27.09" | +0.88% | +80 mm | 60.5 mph | calculate → |
| 195/50R20 | 27.68" | +3.08% | +50 mm | 61.8 mph | calculate → |
| 155/60R20 | 27.32" | +1.76% | +10 mm | 61.1 mph | calculate → |
| 145/65R20 | 27.42" | +2.13% | 0 mm | 61.3 mph | calculate → |
| 175/55R20 | 27.58" | +2.71% | +30 mm | 61.6 mph | calculate → |
| 315/25R20 | 26.20" | -2.42% | +170 mm | 58.5 mph | calculate → |
| 165/60R20 | 27.80" | +3.52% | +20 mm | 62.1 mph | calculate → |
| 155/65R20 | 27.93" | +4.03% | +10 mm | 62.4 mph | calculate → |
| 225/45R20 | 27.97" | +4.18% | +80 mm | 62.5 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" | -0.50% | +100 mm | 59.7 mph | calculate → |
| 255/40R19 common | 27.03" | +0.67% | +110 mm | 60.4 mph | calculate → |
| 225/45R19 common | 26.97" | +0.45% | +80 mm | 60.3 mph | calculate → |
| 285/35R19 common | 26.85" | +0.01% | +140 mm | 60.0 mph | calculate → |
| 325/30R19 | 26.68" | -0.65% | +180 mm | 59.6 mph | calculate → |
| 255/30R21 | 27.02" | +0.65% | +110 mm | 60.4 mph | calculate → |
| 295/25R21 | 26.81" | -0.16% | +150 mm | 59.9 mph | calculate → |
| 305/25R21 | 27.00" | +0.57% | +160 mm | 60.3 mph | calculate → |
| 245/30R21 | 26.79" | -0.23% | +100 mm | 59.9 mph | calculate → |
| 195/50R19 | 26.68" | -0.65% | +50 mm | 59.6 mph | calculate → |
| 335/30R19 | 26.91" | +0.23% | +190 mm | 60.1 mph | calculate → |
Try another size against 145/60R20
Questions
What size is 145/60R20 in inches?
145/60R20 is about 26.9" tall and 5.7" wide on a 20-inch rim — roughly a 27x5.50R20 in inch sizing.
What does 145/60R20 mean?
145 mm section width, sidewall 60% of the width (3.43"), radial construction, 20-inch rim.
What tire sizes are equivalent to 145/60R20?
On the same 20" rim, within 3% of the diameter: 345/25R20 (-0.22%), 245/35R20 (-0.37%), 285/30R20 (-0.44%), 295/30R20 (+0.44%), 255/35R20 (+0.66%), 225/40R20 (+0.88%).
How many revolutions per mile does a 145/60R20 tire make?
About 751 revolutions per mile (circumference 84.4").
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.