285/65R20 tire size
285/65R20 is a metric size: 34.6" tall, 11.2" wide, on a 20" rim — about a 34.5x11.00R20. The sidewall is 7.3" and the tire turns 583 times per mile.
285/65R20 specs
| Overall diameter (height) | 34.59" · 879 mm |
|---|---|
| Section width | 11.22" · 285 mm |
| Sidewall height | 7.29" · 185 mm (65% of width) |
| Rim diameter | 20" |
| Circumference | 108.66" · 2.760 m |
| Revolutions per mile | 583 (362 per km) |
| Inch (flotation) equivalent | 34.5x11.00R20 |
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 | |
|---|---|---|---|---|---|
| 275/60R20 common | 32.99" | -4.61% | -10 mm | 57.2 mph | compare → |
| 275/65R20 common | 34.07" | -1.48% | -10 mm | 59.1 mph | compare → |
| 35x12.50R20 common | 35.00" | +1.20% | +33 mm | 60.7 mph | compare → |
| 305/55R20 common | 33.21" | -3.98% | +20 mm | 57.6 mph | compare → |
| 285/60R20 common | 33.46" | -3.24% | 0 mm | 58.1 mph | compare → |
| 33x12.50R20 common | 33.00" | -4.59% | +33 mm | 57.2 mph | compare → |
| 295/60R20 | 33.94" | -1.88% | +10 mm | 58.9 mph | compare → |
| 295/65R20 | 35.10" | +1.48% | +10 mm | 60.9 mph | compare → |
| 325/60R20 | 35.35" | +2.22% | +40 mm | 61.3 mph | compare → |
| 35x11.50R20 | 35.00" | +1.20% | +7 mm | 60.7 mph | compare → |
| 35x13.50R20 | 35.00" | +1.20% | +58 mm | 60.7 mph | compare → |
| 315/60R20 | 34.88" | +0.85% | +30 mm | 60.5 mph | calculate → |
| 35x15.50R20 | 35.00" | +1.20% | +109 mm | 60.7 mph | calculate → |
| 33x13.50R20 | 33.00" | -4.59% | +58 mm | 57.2 mph | calculate → |
| 33x11.50R20 | 33.00" | -4.59% | +7 mm | 57.2 mph | calculate → |
| 36x13.50R20 | 36.00" | +4.09% | +58 mm | 62.5 mph | calculate → |
| 305/60R20 | 34.41" | -0.51% | +20 mm | 59.7 mph | calculate → |
| 35x13.00R20 | 35.00" | +1.20% | +45 mm | 60.7 mph | calculate → |
| 35x14.50R20 | 35.00" | +1.20% | +83 mm | 60.7 mph | calculate → |
| 34x11.50R20 | 34.00" | -1.70% | +7 mm | 59.0 mph | calculate → |
| 285/70R20 | 35.71" | +3.24% | 0 mm | 61.9 mph | calculate → |
| 375/45R20 | 33.29" | -3.76% | +90 mm | 57.7 mph | calculate → |
| 36x15.50R20 | 36.00" | +4.09% | +109 mm | 62.5 mph | calculate → |
| 33x12.00R20 | 33.00" | -4.59% | +20 mm | 57.2 mph | calculate → |
| 33x22.00R20 | 33.00" | -4.59% | +274 mm | 57.2 mph | calculate → |
| 375/55R20 | 36.24" | +4.78% | +90 mm | 62.9 mph | calculate → |
| 355/50R20 | 33.98" | -1.76% | +70 mm | 58.9 mph | calculate → |
| 33x14.50R20 | 33.00" | -4.59% | +83 mm | 57.2 mph | calculate → |
| 345/60R20 | 36.30" | +4.95% | +60 mm | 63.0 mph | calculate → |
Try another size against 285/65R20
Questions
What size is 285/65R20 in inches?
285/65R20 is about 34.6" tall and 11.2" wide on a 20-inch rim — roughly a 34.5x11.00R20 in inch sizing.
What does 285/65R20 mean?
285 mm section width, sidewall 65% of the width (7.29"), radial construction, 20-inch rim.
What tire sizes are equivalent to 285/65R20?
On the same 20" rim, within 3% of the diameter: 305/60R20 (-0.51%), 315/60R20 (+0.85%), 35x11.50R20 (+1.20%), 35x12.50R20 (+1.20%), 35x13.50R20 (+1.20%), 35x13.00R20 (+1.20%).
How many revolutions per mile does a 285/65R20 tire make?
About 583 revolutions per mile (circumference 108.7").
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.