245/55R20 tire size in inches
A 245/55R20 tire measures
30.6" tall × 9.6" wide
5.31" sidewall on a 20" wheel. 659 revolutions per mile.
245/55R20 means a tire 245 mm wide, with sidewalls 55% as tall as the tire is wide (135 mm), radial construction (R), for a 20 inch wheel.
245/55R20 specs
| Overall diameter (height) | 30.61 inches (778 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 5.31 inches (135 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 96.2 inches (2,443 mm) |
| Revolutions per mile | 659 |
| Revolutions per kilometer | 409 |
| Approximate rim width | 7.0" to 8.5" |
| In inches (flotation style) | 30.6x9.6R20 |
| 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 245/55R20 on a 20" wheel
These 20" sizes are within 3% of 245/55R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 225/60R20 | 30.63" | 8.86" | +0.1% | 60.0 mph | Compare |
| 335/40R20 | 30.55" | 13.19" | −0.2% | 59.9 mph | Compare |
| 295/45R20 | 30.45" | 11.61" | −0.5% | 59.7 mph | Compare |
| 265/50R20 | 30.43" | 10.43" | −0.6% | 59.7 mph | Compare |
| 305/45R20 | 30.81" | 12.01" | +0.6% | 60.4 mph | Compare |
| 275/50R20 | 30.83" | 10.83" | +0.7% | 60.4 mph | Compare |
| 345/40R20 | 30.87" | 13.58" | +0.8% | 60.5 mph | Compare |
| 325/40R20 | 30.24" | 12.80" | −1.2% | 59.3 mph | Compare |
| 215/65R20 | 31.00" | 8.46" | +1.3% | 60.8 mph | Compare |
| 235/55R20 | 30.18" | 9.25" | −1.4% | 59.2 mph | Compare |
| 255/55R20 | 31.04" | 10.04" | +1.4% | 60.8 mph | Compare |
| 215/60R20 | 30.16" | 8.46" | −1.5% | 59.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 265/70R16 | 16" | 30.61" | 0.0% | Compare |
| 305/40R21 | 21" | 30.61" | 0.0% | Compare |
| 295/50R19 | 19" | 30.61" | 0.0% | Compare |
| 335/25R24 | 24" | 30.59" | −0.1% | Compare |
| 285/65R16 | 16" | 30.59" | −0.1% | Compare |
| 315/55R17 | 17" | 30.64" | +0.1% | Compare |
| 245/60R19 | 19" | 30.57" | −0.1% | Compare |
| 245/50R21 | 21" | 30.65" | +0.1% | Compare |
| 265/75R15 | 15" | 30.65" | +0.1% | Compare |
| 265/65R17 | 17" | 30.56" | −0.2% | Compare |
| 275/40R22 | 22" | 30.66" | +0.2% | Compare |
| 245/65R18 | 18" | 30.54" | −0.2% | Compare |
One size up or down
- 235/55R20narrower: 30.2" × 9.3"
- 255/55R20wider: 31.0" × 10.0"
- 245/50R20lower profile: 29.6" × 9.6"
- 245/60R20taller sidewall: 31.6" × 9.6"
Compare 245/55R20 with another size
Questions
- How tall is a 245/55R20 tire?
- A 245/55R20 tire is 30.6 inches tall (778 mm), calculated from the size. It is 9.6 inches wide with 5.3 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/55R20 mean?
- 245/55R20 means a tire 245 mm wide, with sidewalls 55% as tall as the tire is wide (135 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 245/55R20 tire make?
- About 659 revolutions per mile, based on a circumference of 96.2 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/55R20 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 225/60R20 instead of 245/55R20?
- 225/60R20 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.