285/50R20 tire size in inches
A 285/50R20 tire measures
31.2" tall × 11.2" wide
5.61" sidewall on a 20" wheel. 646 revolutions per mile.
285/50R20 means a tire 285 mm wide, with sidewalls 50% as tall as the tire is wide (143 mm), radial construction (R), for a 20 inch wheel.
285/50R20 specs
| Overall diameter (height) | 31.22 inches (793 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 5.61 inches (143 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 98.1 inches (2,491 mm) |
| Revolutions per mile | 646 |
| Revolutions per kilometer | 401 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 31.2x11.2R20 |
| Aspect ratio | 50% |
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 285/50R20 on a 20" wheel
These 20" sizes are within 3% of 285/50R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 355/40R20 | 31.18" | 13.98" | −0.1% | 59.9 mph | Compare |
| 315/45R20 | 31.16" | 12.40" | −0.2% | 59.9 mph | Compare |
| 235/60R20 | 31.10" | 9.25" | −0.4% | 59.8 mph | Compare |
| 255/55R20 | 31.04" | 10.04" | −0.6% | 59.7 mph | Compare |
| 215/65R20 | 31.00" | 8.46" | −0.7% | 59.6 mph | Compare |
| 265/55R20 | 31.48" | 10.43" | +0.8% | 60.5 mph | Compare |
| 225/65R20 | 31.52" | 8.86" | +0.9% | 60.6 mph | Compare |
| 325/45R20 | 31.52" | 12.80" | +0.9% | 60.6 mph | Compare |
| 345/40R20 | 30.87" | 13.58" | −1.1% | 59.3 mph | Compare |
| 245/60R20 | 31.57" | 9.65" | +1.1% | 60.7 mph | Compare |
| 275/50R20 | 30.83" | 10.83" | −1.3% | 59.2 mph | Compare |
| 295/50R20 | 31.61" | 11.61" | +1.3% | 60.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 345/45R19 | 19" | 31.22" | 0.0% | Compare |
| 305/55R18 | 18" | 31.21" | 0.0% | Compare |
| 335/35R22 | 22" | 31.23" | 0.0% | Compare |
| 305/30R24 | 24" | 31.20" | −0.1% | Compare |
| 325/40R21 | 21" | 31.24" | +0.1% | Compare |
| 275/75R15 | 15" | 31.24" | +0.1% | Compare |
| 235/50R22 | 22" | 31.25" | +0.1% | Compare |
| 335/50R18 | 18" | 31.19" | −0.1% | Compare |
| 235/55R21 | 21" | 31.18" | −0.1% | Compare |
| 275/70R16 | 16" | 31.16" | −0.2% | Compare |
| 225/75R18 | 18" | 31.29" | +0.2% | Compare |
| 295/40R22 | 22" | 31.29" | +0.2% | Compare |
One size up or down
- 275/50R20narrower: 30.8" × 10.8"
- 295/50R20wider: 31.6" × 11.6"
- 285/45R20lower profile: 30.1" × 11.2"
- 285/55R20taller sidewall: 32.3" × 11.2"
Compare 285/50R20 with another size
Questions
- How tall is a 285/50R20 tire?
- A 285/50R20 tire is 31.2 inches tall (793 mm), calculated from the size. It is 11.2 inches wide with 5.6 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/50R20 mean?
- 285/50R20 means a tire 285 mm wide, with sidewalls 50% as tall as the tire is wide (143 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 285/50R20 tire make?
- About 646 revolutions per mile, based on a circumference of 98.1 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/50R20 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 355/40R20 instead of 285/50R20?
- 355/40R20 is −0.04 inches (−0.1%) in overall diameter, so at an indicated 60 mph you would be doing 59.9 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.