255/65R20 tire size in inches
A 255/65R20 tire measures
33.1" tall × 10.0" wide
6.53" sidewall on a 20" wheel. 610 revolutions per mile.
255/65R20 means a tire 255 mm wide, with sidewalls 65% as tall as the tire is wide (166 mm), radial construction (R), for a 20 inch wheel.
255/65R20 specs
| Overall diameter (height) | 33.05 inches (840 mm) |
|---|---|
| Section width | 10.04 inches (255 mm) |
| Sidewall height | 6.53 inches (166 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 103.8 inches (2,637 mm) |
| Revolutions per mile | 610 |
| Revolutions per kilometer | 379 |
| Approximate rim width | 7.0" to 8.5" |
| In inches (flotation style) | 33.1x10.0R20 |
| Aspect ratio | 65% |
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 255/65R20 on a 20" wheel
These 20" sizes are within 3% of 255/65R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 33x12.50R20 | 33.00" | 12.50" | −0.2% | 59.9 mph | Compare |
| 275/60R20 | 32.99" | 10.83" | −0.2% | 59.9 mph | Compare |
| 335/50R20 | 33.19" | 13.19" | +0.4% | 60.3 mph | Compare |
| 305/55R20 | 33.21" | 12.01" | +0.5% | 60.3 mph | Compare |
| 325/50R20 | 32.80" | 12.80" | −0.8% | 59.5 mph | Compare |
| 295/55R20 | 32.78" | 11.61" | −0.8% | 59.5 mph | Compare |
| 285/60R20 | 33.46" | 11.22" | +1.3% | 60.8 mph | Compare |
| 355/45R20 | 32.58" | 13.98" | −1.4% | 59.1 mph | Compare |
| 265/65R20 | 33.56" | 10.43" | +1.5% | 60.9 mph | Compare |
| 245/65R20 | 32.54" | 9.65" | −1.5% | 59.1 mph | Compare |
| 265/60R20 | 32.52" | 10.43" | −1.6% | 59.0 mph | Compare |
| 345/50R20 | 33.58" | 13.58" | +1.6% | 61.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 255/75R18 | 18" | 33.06" | 0.0% | Compare |
| 255/55R22 | 22" | 33.04" | 0.0% | Compare |
| 255/85R16 | 16" | 33.07" | 0.0% | Compare |
| 275/65R19 | 19" | 33.07" | +0.1% | Compare |
| 325/55R19 | 19" | 33.07" | +0.1% | Compare |
| 305/50R21 | 21" | 33.01" | −0.1% | Compare |
| 295/65R18 | 18" | 33.10" | +0.1% | Compare |
| 33x12.50R15 | 15" | 33.00" | −0.2% | Compare |
| 33x12.50R16 | 16" | 33.00" | −0.2% | Compare |
| 33x12.50R17 | 17" | 33.00" | −0.2% | Compare |
| 33x12.50R18 | 18" | 33.00" | −0.2% | Compare |
| 33x12.50R22 | 22" | 33.00" | −0.2% | Compare |
One size up or down
Compare 255/65R20 with another size
Questions
- How tall is a 255/65R20 tire?
- A 255/65R20 tire is 33.1 inches tall (840 mm), calculated from the size. It is 10.0 inches wide with 6.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 255/65R20 mean?
- 255/65R20 means a tire 255 mm wide, with sidewalls 65% as tall as the tire is wide (166 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 255/65R20 tire make?
- About 610 revolutions per mile, based on a circumference of 103.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 255/65R20 tire?
- Roughly 7.0" to 8.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 33x12.50R20 instead of 255/65R20?
- 33x12.50R20 is −0.05 inches (−0.2%) 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.