225/55R20 tire size in inches
A 225/55R20 tire measures
29.7" tall × 8.9" wide
4.87" sidewall on a 20" wheel. 678 revolutions per mile.
225/55R20 means a tire 225 mm wide, with sidewalls 55% as tall as the tire is wide (124 mm), radial construction (R), for a 20 inch wheel.
225/55R20 specs
| Overall diameter (height) | 29.74 inches (756 mm) |
|---|---|
| Section width | 8.86 inches (225 mm) |
| Sidewall height | 4.87 inches (124 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 93.4 inches (2,373 mm) |
| Revolutions per mile | 678 |
| Revolutions per kilometer | 421 |
| Approximate rim width | 6.5" to 8.0" |
| In inches (flotation style) | 29.7x8.9R20 |
| 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 225/55R20 on a 20" wheel
These 20" sizes are within 3% of 225/55R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 275/45R20 | 29.74" | 10.83" | 0.0% | 60.0 mph | Compare |
| 355/35R20 | 29.78" | 13.98" | +0.1% | 60.1 mph | Compare |
| 245/50R20 | 29.65" | 9.65" | −0.3% | 59.8 mph | Compare |
| 305/40R20 | 29.61" | 12.01" | −0.5% | 59.7 mph | Compare |
| 315/40R20 | 29.92" | 12.40" | +0.6% | 60.4 mph | Compare |
| 345/35R20 | 29.51" | 13.58" | −0.8% | 59.5 mph | Compare |
| 255/50R20 | 30.04" | 10.04" | +1.0% | 60.6 mph | Compare |
| 285/45R20 | 30.10" | 11.22" | +1.2% | 60.7 mph | Compare |
| 265/45R20 | 29.39" | 10.43" | −1.2% | 59.3 mph | Compare |
| 215/60R20 | 30.16" | 8.46" | +1.4% | 60.8 mph | Compare |
| 215/55R20 | 29.31" | 8.46" | −1.5% | 59.1 mph | Compare |
| 235/55R20 | 30.18" | 9.25" | +1.5% | 60.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 235/85R14 | 14" | 29.73" | −0.1% | Compare |
| 205/85R16 | 16" | 29.72" | −0.1% | Compare |
| 245/40R22 | 22" | 29.72" | −0.1% | Compare |
| 295/55R17 | 17" | 29.78" | +0.1% | Compare |
| 215/75R17 | 17" | 29.70" | −0.2% | Compare |
| 235/80R15 | 15" | 29.80" | +0.2% | Compare |
| 245/45R21 | 21" | 29.68" | −0.2% | Compare |
| 295/25R24 | 24" | 29.81" | +0.2% | Compare |
| 305/45R19 | 19" | 29.81" | +0.2% | Compare |
| 315/35R21 | 21" | 29.68" | −0.2% | Compare |
| 325/30R22 | 22" | 29.68" | −0.2% | Compare |
| 275/50R19 | 19" | 29.83" | +0.3% | Compare |
One size up or down
- 215/55R20narrower: 29.3" × 8.5"
- 235/55R20wider: 30.2" × 9.3"
- 225/50R20lower profile: 28.9" × 8.9"
- 225/60R20taller sidewall: 30.6" × 8.9"
Compare 225/55R20 with another size
Questions
- How tall is a 225/55R20 tire?
- A 225/55R20 tire is 29.7 inches tall (756 mm), calculated from the size. It is 8.9 inches wide with 4.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 225/55R20 mean?
- 225/55R20 means a tire 225 mm wide, with sidewalls 55% as tall as the tire is wide (124 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 225/55R20 tire make?
- About 678 revolutions per mile, based on a circumference of 93.4 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 225/55R20 tire?
- Roughly 6.5" to 8.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 275/45R20 instead of 225/55R20?
- 275/45R20 is 0.00 inches (0.0%) 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.