285/55R20 tire size in inches
A 285/55R20 tire measures
32.3" tall × 11.2" wide
6.17" sidewall on a 20" wheel. 624 revolutions per mile.
285/55R20 means a tire 285 mm wide, with sidewalls 55% as tall as the tire is wide (157 mm), radial construction (R), for a 20 inch wheel.
285/55R20 specs
| Overall diameter (height) | 32.34 inches (822 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 6.17 inches (157 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 101.6 inches (2,581 mm) |
| Revolutions per mile | 624 |
| Revolutions per kilometer | 387 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 32.3x11.2R20 |
| Aspect ratio | 55% |
Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.
Sizes that can replace 285/55R20 on a 20" wheel
These 20" sizes are within 3% of 285/55R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 315/50R20 | 32.40" | 12.40" | +0.2% | 60.1 mph | Compare |
| 345/45R20 | 32.22" | 13.58" | −0.4% | 59.8 mph | Compare |
| 265/60R20 | 32.52" | 10.43" | +0.5% | 60.3 mph | Compare |
| 245/65R20 | 32.54" | 9.65" | +0.6% | 60.4 mph | Compare |
| 355/45R20 | 32.58" | 13.98" | +0.7% | 60.4 mph | Compare |
| 255/60R20 | 32.05" | 10.04" | −0.9% | 59.5 mph | Compare |
| 235/65R20 | 32.03" | 9.25" | −1.0% | 59.4 mph | Compare |
| 305/50R20 | 32.01" | 12.01" | −1.0% | 59.4 mph | Compare |
| 275/55R20 | 31.91" | 10.83" | −1.3% | 59.2 mph | Compare |
| 295/55R20 | 32.78" | 11.61" | +1.3% | 60.8 mph | Compare |
| 325/50R20 | 32.80" | 12.80" | +1.4% | 60.8 mph | Compare |
| 335/45R20 | 31.87" | 13.19" | −1.5% | 59.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 265/40R24 | 24" | 32.35" | 0.0% | Compare |
| 275/80R15 | 15" | 32.32" | −0.1% | Compare |
| 355/30R24 | 24" | 32.39" | +0.1% | Compare |
| 245/85R16 | 16" | 32.40" | +0.2% | Compare |
| 305/35R24 | 24" | 32.41" | +0.2% | Compare |
| 305/60R18 | 18" | 32.41" | +0.2% | Compare |
| 295/70R16 | 16" | 32.26" | −0.3% | Compare |
| 265/50R22 | 22" | 32.43" | +0.3% | Compare |
| 275/75R16 | 16" | 32.24" | −0.3% | Compare |
| 325/40R22 | 22" | 32.24" | −0.3% | Compare |
| 295/45R22 | 22" | 32.45" | +0.3% | Compare |
| 285/60R19 | 19" | 32.46" | +0.4% | Compare |
One size up or down
- 275/55R20narrower: 31.9" × 10.8"
- 295/55R20wider: 32.8" × 11.6"
- 285/50R20lower profile: 31.2" × 11.2"
- 285/60R20taller sidewall: 33.5" × 11.2"
Compare 285/55R20 with another size
Questions
- How tall is a 285/55R20 tire?
- A 285/55R20 tire is 32.3 inches tall (822 mm), calculated from the size. It is 11.2 inches wide with 6.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/55R20 mean?
- 285/55R20 means a tire 285 mm wide, with sidewalls 55% as tall as the tire is wide (157 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 285/55R20 tire make?
- About 624 revolutions per mile, based on a circumference of 101.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/55R20 tire?
- Roughly 8.0" to 9.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 315/50R20 instead of 285/55R20?
- 315/50R20 is +0.06 inches (+0.2%) in overall diameter, so at an indicated 60 mph you would be doing 60.1 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.