255/55R20 tire size in inches
A 255/55R20 tire measures
31.0" tall × 10.0" wide
5.52" sidewall on a 20" wheel. 650 revolutions per mile.
255/55R20 means a tire 255 mm wide, with sidewalls 55% as tall as the tire is wide (140 mm), radial construction (R), for a 20 inch wheel.
255/55R20 specs
| Overall diameter (height) | 31.04 inches (789 mm) |
|---|---|
| Section width | 10.04 inches (255 mm) |
| Sidewall height | 5.52 inches (140 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 97.5 inches (2,477 mm) |
| Revolutions per mile | 650 |
| Revolutions per kilometer | 404 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 31.0x10.0R20 |
| 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 255/55R20 on a 20" wheel
These 20" sizes are within 3% of 255/55R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 215/65R20 | 31.00" | 8.46" | −0.1% | 59.9 mph | Compare |
| 235/60R20 | 31.10" | 9.25" | +0.2% | 60.1 mph | Compare |
| 315/45R20 | 31.16" | 12.40" | +0.4% | 60.2 mph | Compare |
| 355/40R20 | 31.18" | 13.98" | +0.4% | 60.3 mph | Compare |
| 285/50R20 | 31.22" | 11.22" | +0.6% | 60.3 mph | Compare |
| 345/40R20 | 30.87" | 13.58" | −0.6% | 59.7 mph | Compare |
| 275/50R20 | 30.83" | 10.83" | −0.7% | 59.6 mph | Compare |
| 305/45R20 | 30.81" | 12.01" | −0.8% | 59.5 mph | Compare |
| 225/60R20 | 30.63" | 8.86" | −1.3% | 59.2 mph | Compare |
| 265/55R20 | 31.48" | 10.43" | +1.4% | 60.8 mph | Compare |
| 245/55R20 | 30.61" | 9.65" | −1.4% | 59.2 mph | Compare |
| 225/65R20 | 31.52" | 8.86" | +1.5% | 60.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 255/60R19 | 19" | 31.05" | 0.0% | Compare |
| 255/50R21 | 21" | 31.04" | 0.0% | Compare |
| 255/65R18 | 18" | 31.05" | 0.0% | Compare |
| 255/45R22 | 22" | 31.04" | 0.0% | Compare |
| 255/70R17 | 17" | 31.06" | 0.0% | Compare |
| 225/85R16 | 16" | 31.06" | +0.1% | Compare |
| 235/65R19 | 19" | 31.03" | −0.1% | Compare |
| 255/75R16 | 16" | 31.06" | +0.1% | Compare |
| 255/35R24 | 24" | 31.03" | −0.1% | Compare |
| 255/80R15 | 15" | 31.06" | +0.1% | Compare |
| 255/85R14 | 14" | 31.07" | +0.1% | Compare |
| 275/65R17 | 17" | 31.07" | +0.1% | Compare |
One size up or down
- 245/55R20narrower: 30.6" × 9.6"
- 265/55R20wider: 31.5" × 10.4"
- 255/50R20lower profile: 30.0" × 10.0"
- 255/60R20taller sidewall: 32.0" × 10.0"
Compare 255/55R20 with another size
Questions
- How tall is a 255/55R20 tire?
- A 255/55R20 tire is 31.0 inches tall (789 mm), calculated from the size. It is 10.0 inches wide with 5.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 255/55R20 mean?
- 255/55R20 means a tire 255 mm wide, with sidewalls 55% as tall as the tire is wide (140 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 255/55R20 tire make?
- About 650 revolutions per mile, based on a circumference of 97.5 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 255/55R20 tire?
- Roughly 7.5" to 9.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 215/65R20 instead of 255/55R20?
- 215/65R20 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.