225/45R20 tire size in inches
A 225/45R20 tire measures
28.0" tall × 8.9" wide
3.99" sidewall on a 20" wheel. 721 revolutions per mile.
225/45R20 means a tire 225 mm wide, with sidewalls 45% as tall as the tire is wide (101 mm), radial construction (R), for a 20 inch wheel.
225/45R20 specs
| Overall diameter (height) | 27.97 inches (710 mm) |
|---|---|
| Section width | 8.86 inches (225 mm) |
| Sidewall height | 3.99 inches (101 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 87.9 inches (2,232 mm) |
| Revolutions per mile | 721 |
| Revolutions per kilometer | 448 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 28.0x8.9R20 |
| Aspect ratio | 45% |
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 225/45R20 on a 20" wheel
These 20" sizes are within 3% of 225/45R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 255/40R20 | 28.03" | 10.04" | +0.2% | 60.1 mph | Compare |
| 335/30R20 | 27.91" | 13.19" | −0.2% | 59.9 mph | Compare |
| 285/35R20 | 27.85" | 11.22" | −0.4% | 59.7 mph | Compare |
| 295/35R20 | 28.13" | 11.61" | +0.6% | 60.3 mph | Compare |
| 345/30R20 | 28.15" | 13.58" | +0.6% | 60.4 mph | Compare |
| 245/40R20 | 27.72" | 9.65" | −0.9% | 59.5 mph | Compare |
| 325/30R20 | 27.68" | 12.80" | −1.1% | 59.4 mph | Compare |
| 215/45R20 | 27.62" | 8.46" | −1.3% | 59.2 mph | Compare |
| 235/45R20 | 28.33" | 9.25" | +1.3% | 60.8 mph | Compare |
| 265/40R20 | 28.35" | 10.43" | +1.3% | 60.8 mph | Compare |
| 275/35R20 | 27.58" | 10.83" | −1.4% | 59.2 mph | Compare |
| 355/30R20 | 28.39" | 13.98" | +1.5% | 60.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 285/40R19 | 19" | 27.98" | 0.0% | Compare |
| 295/30R21 | 21" | 27.97" | 0.0% | Compare |
| 195/65R18 | 18" | 27.98" | 0.0% | Compare |
| 325/35R19 | 19" | 27.96" | −0.1% | Compare |
| 355/25R21 | 21" | 27.99" | +0.1% | Compare |
| 235/70R15 | 15" | 27.95" | −0.1% | Compare |
| 275/60R15 | 15" | 27.99" | +0.1% | Compare |
| 215/65R17 | 17" | 28.00" | +0.1% | Compare |
| 305/25R22 | 22" | 28.00" | +0.1% | Compare |
| 185/75R17 | 17" | 27.93" | −0.2% | Compare |
| 315/40R18 | 18" | 27.92" | −0.2% | Compare |
| 255/30R22 | 22" | 28.02" | +0.2% | Compare |
One size up or down
- 215/45R20narrower: 27.6" × 8.5"
- 235/45R20wider: 28.3" × 9.3"
- 225/40R20lower profile: 27.1" × 8.9"
- 225/50R20taller sidewall: 28.9" × 8.9"
Compare 225/45R20 with another size
Questions
- How tall is a 225/45R20 tire?
- A 225/45R20 tire is 28.0 inches tall (710 mm), calculated from the size. It is 8.9 inches wide with 4.0 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 225/45R20 mean?
- 225/45R20 means a tire 225 mm wide, with sidewalls 45% as tall as the tire is wide (101 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 225/45R20 tire make?
- About 721 revolutions per mile, based on a circumference of 87.9 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 225/45R20 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 255/40R20 instead of 225/45R20?
- 255/40R20 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.