Home › 20" tire sizes › 285/65R20
285/65R20 tire size in inches
285/65R20 is 34.59" tall and 11.22" wide, and fits a 20" rim. In flotation (inch) sizing that is roughly 34.6x11.2R20.
285/65R20 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 34.59" | 879 mm |
| Section width | 11.22" | 285 mm |
| Sidewall height | 7.29" | 185.2 mm |
| Rim diameter | 20" | 508.0 mm |
| Circumference | 108.7" | 2760 mm |
| Revolutions per mile | 583 | |
| Aspect ratio | 65% (sidewall is 65% of the width) | |
Drawn to scale
Among the 131 sizes for 20" wheels on this site, 285/65R20 is #89 by height (shortest: 225/30R20, tallest: 365/85R20).
What people compare 285/65R20 with
Real comparisons drivers search for, worked out against 285/65R20:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/65R20 | -0.52" (-1.5%) | -0.39" | -0.25" | 60.9 mph |
| 275/60R20 | -1.60" (-4.63%) | -0.39" | -0.79" | 62.9 mph |
| 295/65R20 | +0.51" (+1.47%) | +0.39" | +0.26" | 59.1 mph |
| 285/60R20 | -1.13" (-3.27%) | 0.00" | -0.56" | 62 mph |
| 295/60R20 | -0.65" (-1.88%) | +0.39" | -0.32" | 61.1 mph |
| 305/55R20 | -1.38" (-3.99%) | +0.79" | -0.69" | 62.5 mph |
| 275/55R20 | -2.68" (-7.75%) | -0.39" | -1.34" | 65 mph |
| 285/55R20 | -2.25" (-6.5%) | 0.00" | -1.12" | 64.2 mph |
How the 285/65R20 numbers are worked out
The size code reads as 285 mm section width, 65% aspect ratio, R for radial construction and 20-inch wheel.
- Sidewall = 285 × 65% = 185.2 mm = 7.29"
- Diameter = 20" + 2 × 7.29" = 34.59"
- Circumference = π × 34.59" = 108.7"
- Revs per mile = 63,360" ÷ 108.7" = 583
Sizes that can replace 285/65R20 on a 20" wheel
Within 3% of 34.59". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 265/70R20 | 34.61" | 10.43" | +0.06% | 60 mph |
| 305/60R20 | 34.41" | 12.01" | -0.52% | 60.3 mph |
| 290/65R20 | 34.84" | 11.42" | +0.72% | 59.6 mph |
| 280/65R20 | 34.33" | 11.02" | -0.75% | 60.5 mph |
| 315/60R20 | 34.88" | 12.40" | +0.84% | 59.5 mph |
| 345/55R20 | 34.94" | 13.58" | +1.01% | 59.4 mph |
| 255/75R20 | 35.06" | 10.04" | +1.36% | 59.2 mph |
| 295/65R20 | 35.10" | 11.61" | +1.47% | 59.1 mph |
| 275/65R20 | 34.07" | 10.83" | -1.5% | 60.9 mph |
| 325/55R20 | 34.07" | 12.80" | -1.5% | 60.9 mph |
| 255/70R20 | 34.06" | 10.04" | -1.53% | 60.9 mph |
| 320/60R20 | 35.12" | 12.60" | +1.53% | 59.1 mph |
One size wider or narrower
Same height on a different wheel size
- 325/75R15 15" (-1.16%)
- 315/75R16 16" (+0.03%)
- 295/80R16 16" (-0.03%)
- 275/85R16 16" (-0.52%)
- 285/85R16 16" (+1.39%)
- 305/75R16 16" (-1.68%)
- 325/75R16 16" (+1.73%)
- 375/65R16 16" (+1.73%)
- 305/80R16 16" (+1.79%)
- 285/80R16 16" (-1.85%)
Questions about 285/65R20
How tall is a 285/65R20 tire in inches?
A 285/65R20 tire is 34.59 inches (879 mm) tall: the 20-inch rim plus two sidewalls of 7.29 inches each.
Is 285/65R20 a 35 inch tire?
Yes. At 34.59 inches tall it is commonly called a 35-inch tire.
How many revolutions per mile does a 285/65R20 make?
About 583 revolutions per mile, based on a calculated circumference of 108.7 inches.
What size can replace 285/65R20?
265/70R20 is the closest match on a 20" rim (+0.06% height). Check load index, speed rating and clearance first.
Compare 285/65R20 against any other size with the tire size calculator.