285/25R20 tire size
285/25R20 is a metric size: 25.6" tall, 11.2" wide, on a 20" rim — about a 25.5x11.00R20. The sidewall is 2.8" and the tire turns 788 times per mile.
285/25R20 specs
| Overall diameter (height) | 25.61" · 651 mm |
|---|---|
| Section width | 11.22" · 285 mm |
| Sidewall height | 2.81" · 71 mm (25% of width) |
| Rim diameter | 20" |
| Circumference | 80.46" · 2.044 m |
| Revolutions per mile | 788 (489 per km) |
| Inch (flotation) equivalent | 25.5x11.00R20 |
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 | |
|---|---|---|---|---|---|
| 245/35R20 common | 26.75" | +4.46% | -40 mm | 62.7 mph | calculate → |
| 285/30R20 common | 26.73" | +4.38% | 0 mm | 62.6 mph | calculate → |
| 275/30R20 common | 26.50" | +3.46% | -10 mm | 62.1 mph | calculate → |
| 235/35R20 | 26.48" | +3.38% | -50 mm | 62.0 mph | calculate → |
| 245/30R20 | 25.79" | +0.69% | -40 mm | 60.4 mph | calculate → |
| 265/30R20 | 26.26" | +2.54% | -20 mm | 61.5 mph | calculate → |
| 255/30R20 | 26.02" | +1.61% | -30 mm | 61.0 mph | calculate → |
| 225/35R20 | 26.20" | +2.31% | -60 mm | 61.4 mph | calculate → |
| 335/25R20 | 26.59" | +3.84% | +50 mm | 62.3 mph | calculate → |
| 235/30R20 | 25.55" | -0.23% | -50 mm | 59.9 mph | calculate → |
| 305/25R20 | 26.00" | +1.54% | +20 mm | 60.9 mph | calculate → |
| 295/25R20 | 25.81" | +0.77% | +10 mm | 60.5 mph | calculate → |
| 325/25R20 | 26.40" | +3.07% | +40 mm | 61.8 mph | calculate → |
| 225/30R20 | 25.31" | -1.15% | -60 mm | 59.3 mph | calculate → |
| 345/25R20 | 26.79" | +4.61% | +60 mm | 62.8 mph | calculate → |
| 275/25R20 | 25.41" | -0.77% | -10 mm | 59.5 mph | calculate → |
| 145/60R20 | 26.85" | +4.84% | -140 mm | 62.9 mph | calculate → |
| 215/30R20 | 25.08" | -2.08% | -70 mm | 58.8 mph | calculate → |
| 315/25R20 | 26.20" | +2.31% | +30 mm | 61.4 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 | |
|---|---|---|---|---|---|
| 245/35R19 common | 25.75" | +0.55% | -40 mm | 60.3 mph | calculate → |
| 235/35R19 common | 25.48" | -0.52% | -50 mm | 59.7 mph | calculate → |
| 285/30R19 | 25.73" | +0.48% | 0 mm | 60.3 mph | calculate → |
| 275/30R19 | 25.50" | -0.45% | -10 mm | 59.7 mph | calculate → |
Try another size against 285/25R20
Questions
What size is 285/25R20 in inches?
285/25R20 is about 25.6" tall and 11.2" wide on a 20-inch rim — roughly a 25.5x11.00R20 in inch sizing.
What does 285/25R20 mean?
285 mm section width, sidewall 25% of the width (2.81"), radial construction, 20-inch rim.
What tire sizes are equivalent to 285/25R20?
On the same 20" rim, within 3% of the diameter: 235/30R20 (-0.23%), 245/30R20 (+0.69%), 275/25R20 (-0.77%), 295/25R20 (+0.77%), 225/30R20 (-1.15%), 305/25R20 (+1.54%).
How many revolutions per mile does a 285/25R20 tire make?
About 788 revolutions per mile (circumference 80.5").
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.