285/30R20 tire size in inches
A 285/30R20 tire measures
26.7" tall × 11.2" wide
3.37" sidewall on a 20" wheel. 754 revolutions per mile.
285/30R20 means a tire 285 mm wide, with sidewalls 30% as tall as the tire is wide (86 mm), radial construction (R), for a 20 inch wheel.
285/30R20 specs
| Overall diameter (height) | 26.73 inches (679 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 3.37 inches (86 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 84.0 inches (2,133 mm) |
| Revolutions per mile | 754 |
| Revolutions per kilometer | 469 |
| Approximate rim width | 9.5" to 11.0" |
| In inches (flotation style) | 26.7x11.2R20 |
| Aspect ratio | 30% |
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 285/30R20 on a 20" wheel
These 20" sizes are within 3% of 285/30R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 245/35R20 | 26.75" | 9.65" | +0.1% | 60.0 mph | Compare |
| 215/40R20 | 26.77" | 8.46" | +0.1% | 60.1 mph | Compare |
| 345/25R20 | 26.79" | 13.58" | +0.2% | 60.1 mph | Compare |
| 335/25R20 | 26.59" | 13.19" | −0.5% | 59.7 mph | Compare |
| 275/30R20 | 26.50" | 10.83" | −0.9% | 59.5 mph | Compare |
| 295/30R20 | 26.97" | 11.61" | +0.9% | 60.5 mph | Compare |
| 355/25R20 | 26.99" | 13.98" | +1.0% | 60.6 mph | Compare |
| 235/35R20 | 26.48" | 9.25" | −1.0% | 59.4 mph | Compare |
| 255/35R20 | 27.03" | 10.04" | +1.1% | 60.7 mph | Compare |
| 325/25R20 | 26.40" | 12.80" | −1.3% | 59.2 mph | Compare |
| 225/40R20 | 27.09" | 8.86" | +1.3% | 60.8 mph | Compare |
| 265/30R20 | 26.26" | 10.43" | −1.8% | 58.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 205/85R13 | 13" | 26.72" | 0.0% | Compare |
| 225/55R17 | 17" | 26.74" | 0.0% | Compare |
| 275/45R17 | 17" | 26.74" | 0.0% | Compare |
| 195/70R16 | 16" | 26.75" | +0.1% | Compare |
| 245/40R19 | 19" | 26.72" | −0.1% | Compare |
| 175/85R15 | 15" | 26.71" | −0.1% | Compare |
| 215/75R14 | 14" | 26.70" | −0.1% | Compare |
| 205/60R17 | 17" | 26.69" | −0.2% | Compare |
| 245/45R18 | 18" | 26.68" | −0.2% | Compare |
| 315/35R18 | 18" | 26.68" | −0.2% | Compare |
| 245/30R21 | 21" | 26.79" | +0.2% | Compare |
| 325/30R19 | 19" | 26.68" | −0.2% | Compare |
One size up or down
- 275/30R20narrower: 26.5" × 10.8"
- 295/30R20wider: 27.0" × 11.6"
- 285/25R20lower profile: 25.6" × 11.2"
- 285/35R20taller sidewall: 27.9" × 11.2"
Compare 285/30R20 with another size
Questions
- How tall is a 285/30R20 tire?
- A 285/30R20 tire is 26.7 inches tall (679 mm), calculated from the size. It is 11.2 inches wide with 3.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/30R20 mean?
- 285/30R20 means a tire 285 mm wide, with sidewalls 30% as tall as the tire is wide (86 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 285/30R20 tire make?
- About 754 revolutions per mile, based on a circumference of 84.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/30R20 tire?
- Roughly 9.5" to 11.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 245/35R20 instead of 285/30R20?
- 245/35R20 is +0.02 inches (+0.1%) in overall diameter, so at an indicated 60 mph you would be doing 60.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.