255/25R20 tire size in inches
A 255/25R20 tire measures
25.0" tall × 10.0" wide
2.51" sidewall on a 20" wheel. 806 revolutions per mile.
255/25R20 means a tire 255 mm wide, with sidewalls 25% as tall as the tire is wide (64 mm), radial construction (R), for a 20 inch wheel.
255/25R20 specs
| Overall diameter (height) | 25.02 inches (635 mm) |
|---|---|
| Section width | 10.04 inches (255 mm) |
| Sidewall height | 2.51 inches (64 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 78.6 inches (1,996 mm) |
| Revolutions per mile | 806 |
| Revolutions per kilometer | 501 |
| Approximate rim width | 8.5" to 10.0" |
| In inches (flotation style) | 25.0x10.0R20 |
| Aspect ratio | 25% |
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 255/25R20 on a 20" wheel
These 20" sizes are within 3% of 255/25R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 215/30R20 | 25.08" | 8.46" | +0.2% | 60.1 mph | Compare |
| 245/25R20 | 24.82" | 9.65" | −0.8% | 59.5 mph | Compare |
| 265/25R20 | 25.22" | 10.43" | +0.8% | 60.5 mph | Compare |
| 225/30R20 | 25.31" | 8.86" | +1.2% | 60.7 mph | Compare |
| 235/25R20 | 24.63" | 9.25" | −1.6% | 59.1 mph | Compare |
| 275/25R20 | 25.41" | 10.83" | +1.6% | 60.9 mph | Compare |
| 235/30R20 | 25.55" | 9.25" | +2.1% | 61.3 mph | Compare |
| 225/25R20 | 24.43" | 8.86" | −2.4% | 58.6 mph | Compare |
| 285/25R20 | 25.61" | 11.22" | +2.4% | 61.4 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 175/80R14 | 14" | 25.02" | 0.0% | Compare |
| 255/30R19 | 19" | 25.02" | 0.0% | Compare |
| 185/55R17 | 17" | 25.01" | 0.0% | Compare |
| 235/65R13 | 13" | 25.03" | 0.0% | Compare |
| 255/35R18 | 18" | 25.03" | 0.0% | Compare |
| 255/40R17 | 17" | 25.03" | 0.0% | Compare |
| 215/65R14 | 14" | 25.00" | −0.1% | Compare |
| 255/45R16 | 16" | 25.04" | +0.1% | Compare |
| 305/25R19 | 19" | 25.00" | −0.1% | Compare |
| 255/50R15 | 15" | 25.04" | +0.1% | Compare |
| 165/85R14 | 14" | 25.04" | +0.1% | Compare |
| 255/55R14 | 14" | 25.04" | +0.1% | Compare |
One size up or down
Compare 255/25R20 with another size
Questions
- How tall is a 255/25R20 tire?
- A 255/25R20 tire is 25.0 inches tall (635 mm), calculated from the size. It is 10.0 inches wide with 2.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 255/25R20 mean?
- 255/25R20 means a tire 255 mm wide, with sidewalls 25% as tall as the tire is wide (64 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 255/25R20 tire make?
- About 806 revolutions per mile, based on a circumference of 78.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 255/25R20 tire?
- Roughly 8.5" to 10.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 215/30R20 instead of 255/25R20?
- 215/30R20 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.