285/70R20 tire size
285/70R20 is a metric size: 35.7" tall, 11.2" wide, on a 20" rim — about a 35.5x11.00R20. The sidewall is 7.9" and the tire turns 565 times per mile.
285/70R20 specs
| Overall diameter (height) | 35.71" · 907 mm |
|---|---|
| Section width | 11.22" · 285 mm |
| Sidewall height | 7.85" · 200 mm (70% of width) |
| Rim diameter | 20" |
| Circumference | 112.18" · 2.849 m |
| Revolutions per mile | 565 (351 per km) |
| Inch (flotation) equivalent | 35.5x11.00R20 |
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 | |
|---|---|---|---|---|---|
| 275/65R20 common | 34.07" | -4.58% | -10 mm | 57.3 mph | calculate → |
| 35x12.50R20 common | 35.00" | -1.98% | +33 mm | 58.8 mph | calculate → |
| 295/60R20 | 33.94" | -4.96% | +10 mm | 57.0 mph | calculate → |
| 37x12.50R20 | 37.00" | +3.62% | +33 mm | 62.2 mph | calculate → |
| 37x13.50R20 | 37.00" | +3.62% | +58 mm | 62.2 mph | calculate → |
| 295/65R20 | 35.10" | -1.71% | +10 mm | 59.0 mph | calculate → |
| 285/65R20 | 34.59" | -3.14% | 0 mm | 58.1 mph | calculate → |
| 325/60R20 | 35.35" | -0.99% | +40 mm | 59.4 mph | calculate → |
| 35x11.50R20 | 35.00" | -1.98% | +7 mm | 58.8 mph | calculate → |
| 35x13.50R20 | 35.00" | -1.98% | +58 mm | 58.8 mph | calculate → |
| 315/60R20 | 34.88" | -2.32% | +30 mm | 58.6 mph | calculate → |
| 37x11.50R20 | 37.00" | +3.62% | +7 mm | 62.2 mph | calculate → |
| 35x15.50R20 | 35.00" | -1.98% | +109 mm | 58.8 mph | calculate → |
| 36x13.50R20 | 36.00" | +0.82% | +58 mm | 60.5 mph | calculate → |
| 36x15.50R20 | 36.00" | +0.82% | +109 mm | 60.5 mph | calculate → |
| 375/55R20 | 36.24" | +1.49% | +90 mm | 60.9 mph | calculate → |
| 35x13.00R20 | 35.00" | -1.98% | +45 mm | 58.8 mph | calculate → |
| 35x14.50R20 | 35.00" | -1.98% | +83 mm | 58.8 mph | calculate → |
| 37x14.50R20 | 37.00" | +3.62% | +83 mm | 62.2 mph | calculate → |
| 305/60R20 | 34.41" | -3.64% | +20 mm | 57.8 mph | calculate → |
| 34x11.50R20 | 34.00" | -4.79% | +7 mm | 57.1 mph | calculate → |
| 345/60R20 | 36.30" | +1.65% | +60 mm | 61.0 mph | calculate → |
| 355/60R20 | 36.77" | +2.98% | +70 mm | 61.8 mph | calculate → |
| 355/50R20 | 33.98" | -4.85% | +70 mm | 57.1 mph | calculate → |
Try another size against 285/70R20
Questions
What size is 285/70R20 in inches?
285/70R20 is about 35.7" tall and 11.2" wide on a 20-inch rim — roughly a 35.5x11.00R20 in inch sizing.
What does 285/70R20 mean?
285 mm section width, sidewall 70% of the width (7.85"), radial construction, 20-inch rim.
What tire sizes are equivalent to 285/70R20?
On the same 20" rim, within 3% of the diameter: 36x13.50R20 (+0.82%), 36x15.50R20 (+0.82%), 325/60R20 (-0.99%), 375/55R20 (+1.49%), 345/60R20 (+1.65%), 295/65R20 (-1.71%).
How many revolutions per mile does a 285/70R20 tire make?
About 565 revolutions per mile (circumference 112.2").
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.