155/65R20 tire size
155/65R20 is a metric size: 27.9" tall, 6.1" wide, on a 20" rim — about a 28x6.00R20. The sidewall is 4.0" and the tire turns 722 times per mile.
155/65R20 specs
| Overall diameter (height) | 27.93" · 710 mm |
|---|---|
| Section width | 6.10" · 155 mm |
| Sidewall height | 3.97" · 101 mm (65% of width) |
| Rim diameter | 20" |
| Circumference | 87.75" · 2.229 m |
| Revolutions per mile | 722 (449 per km) |
| Inch (flotation) equivalent | 28x6.00R20 |
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" | +2.68% | +90 mm | 61.6 mph | calculate → |
| 255/45R20 common | 29.04" | +3.95% | +100 mm | 62.4 mph | calculate → |
| 275/40R20 common | 28.66" | +2.61% | +120 mm | 61.6 mph | calculate → |
| 245/40R20 common | 27.72" | -0.78% | +90 mm | 59.5 mph | calculate → |
| 245/35R20 common | 26.75" | -4.23% | +90 mm | 57.5 mph | calculate → |
| 255/35R20 common | 27.03" | -3.24% | +100 mm | 58.1 mph | calculate → |
| 255/40R20 common | 28.03" | +0.35% | +100 mm | 60.2 mph | calculate → |
| 275/35R20 common | 27.58" | -1.27% | +120 mm | 59.2 mph | calculate → |
| 285/35R20 common | 27.85" | -0.28% | +130 mm | 59.8 mph | calculate → |
| 315/35R20 common | 28.68" | +2.68% | +160 mm | 61.6 mph | calculate → |
| 285/30R20 common | 26.73" | -4.30% | +130 mm | 57.4 mph | calculate → |
| 265/35R20 common | 27.30" | -2.26% | +110 mm | 58.6 mph | calculate → |
| 295/30R20 | 26.97" | -3.45% | +140 mm | 57.9 mph | calculate → |
| 305/30R20 | 27.20" | -2.61% | +150 mm | 58.4 mph | calculate → |
| 295/40R20 | 29.29" | +4.86% | +140 mm | 62.9 mph | calculate → |
| 295/35R20 | 28.13" | +0.70% | +140 mm | 60.4 mph | calculate → |
| 305/35R20 | 28.41" | +1.69% | +150 mm | 61.0 mph | calculate → |
| 285/40R20 | 28.98" | +3.74% | +130 mm | 62.2 mph | calculate → |
| 235/50R20 | 29.25" | +4.72% | +80 mm | 62.8 mph | calculate → |
| 235/45R20 | 28.33" | +1.41% | +80 mm | 60.8 mph | calculate → |
| 265/40R20 | 28.35" | +1.48% | +110 mm | 60.9 mph | calculate → |
| 335/25R20 | 26.59" | -4.79% | +180 mm | 57.1 mph | calculate → |
| 315/30R20 | 27.44" | -1.76% | +160 mm | 58.9 mph | calculate → |
| 235/40R20 | 27.40" | -1.90% | +80 mm | 58.9 mph | calculate → |
| 335/30R20 | 27.91" | -0.07% | +180 mm | 60.0 mph | calculate → |
| 325/30R20 | 27.68" | -0.92% | +170 mm | 59.5 mph | calculate → |
| 345/30R20 | 28.15" | +0.78% | +190 mm | 60.5 mph | calculate → |
| 215/45R20 | 27.62" | -1.13% | +60 mm | 59.3 mph | calculate → |
| 345/25R20 | 26.79" | -4.09% | +190 mm | 57.5 mph | calculate → |
| 195/50R20 | 27.68" | -0.92% | +40 mm | 59.5 mph | calculate → |
| 225/40R20 | 27.09" | -3.03% | +70 mm | 58.2 mph | calculate → |
| 325/35R20 | 28.96" | +3.66% | +170 mm | 62.2 mph | calculate → |
| 175/55R20 | 27.58" | -1.27% | +20 mm | 59.2 mph | calculate → |
| 145/65R20 | 27.42" | -1.83% | -10 mm | 58.9 mph | calculate → |
| 155/60R20 | 27.32" | -2.18% | 0 mm | 58.7 mph | calculate → |
| 29x15.00R20 | 29.00" | +3.82% | +226 mm | 62.3 mph | calculate → |
| 29x18.00R20 | 29.00" | +3.82% | +302 mm | 62.3 mph | calculate → |
| 145/60R20 | 26.85" | -3.88% | -10 mm | 57.7 mph | calculate → |
| 225/45R20 | 27.97" | +0.14% | +70 mm | 60.1 mph | calculate → |
| 165/60R20 | 27.80" | -0.49% | +10 mm | 59.7 mph | calculate → |
| 195/55R20 | 28.44" | +1.83% | +40 mm | 61.1 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" | -0.90% | +90 mm | 59.5 mph | calculate → |
| 255/45R19 common | 28.04" | +0.37% | +100 mm | 60.2 mph | calculate → |
| 275/40R19 common | 27.66" | -0.97% | +120 mm | 59.4 mph | calculate → |
| 245/35R21 | 27.75" | -0.65% | +90 mm | 59.6 mph | calculate → |
| 285/40R19 | 27.98" | +0.16% | +130 mm | 60.1 mph | calculate → |
| 255/35R21 | 28.03" | +0.34% | +100 mm | 60.2 mph | calculate → |
| 295/30R21 | 27.97" | +0.13% | +140 mm | 60.1 mph | calculate → |
| 305/30R21 | 28.20" | +0.97% | +150 mm | 60.6 mph | calculate → |
| 285/30R21 | 27.73" | -0.72% | +130 mm | 59.6 mph | calculate → |
| 355/25R21 | 27.99" | +0.20% | +200 mm | 60.1 mph | calculate → |
| 345/25R21 | 27.79" | -0.51% | +190 mm | 59.7 mph | calculate → |
| 315/35R19 | 27.68" | -0.90% | +160 mm | 59.5 mph | calculate → |
| 225/50R19 | 27.86" | -0.27% | +70 mm | 59.8 mph | calculate → |
| 145/80R19 | 28.13" | +0.72% | -10 mm | 60.4 mph | calculate → |
Try another size against 155/65R20
Questions
What size is 155/65R20 in inches?
155/65R20 is about 27.9" tall and 6.1" wide on a 20-inch rim — roughly a 28x6.00R20 in inch sizing.
What does 155/65R20 mean?
155 mm section width, sidewall 65% of the width (3.97"), radial construction, 20-inch rim.
What tire sizes are equivalent to 155/65R20?
On the same 20" rim, within 3% of the diameter: 335/30R20 (-0.07%), 225/45R20 (+0.14%), 285/35R20 (-0.28%), 255/40R20 (+0.35%), 165/60R20 (-0.49%), 295/35R20 (+0.70%).
How many revolutions per mile does a 155/65R20 tire make?
About 722 revolutions per mile (circumference 87.8").
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.