225/40R20 tire size in inches
A 225/40R20 tire measures
27.1" tall × 8.9" wide
3.54" sidewall on a 20" wheel. 745 revolutions per mile.
225/40R20 means a tire 225 mm wide, with sidewalls 40% as tall as the tire is wide (90 mm), radial construction (R), for a 20 inch wheel.
225/40R20 specs
| Overall diameter (height) | 27.09 inches (688 mm) |
|---|---|
| Section width | 8.86 inches (225 mm) |
| Sidewall height | 3.54 inches (90 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 85.1 inches (2,161 mm) |
| Revolutions per mile | 745 |
| Revolutions per kilometer | 463 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 27.1x8.9R20 |
| Aspect ratio | 40% |
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 225/40R20 on a 20" wheel
These 20" sizes are within 3% of 225/40R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 255/35R20 | 27.03" | 10.04" | −0.2% | 59.9 mph | Compare |
| 355/25R20 | 26.99" | 13.98" | −0.4% | 59.8 mph | Compare |
| 305/30R20 | 27.20" | 12.01" | +0.4% | 60.3 mph | Compare |
| 295/30R20 | 26.97" | 11.61" | −0.4% | 59.7 mph | Compare |
| 265/35R20 | 27.30" | 10.43" | +0.8% | 60.5 mph | Compare |
| 345/25R20 | 26.79" | 13.58" | −1.1% | 59.3 mph | Compare |
| 215/40R20 | 26.77" | 8.46" | −1.2% | 59.3 mph | Compare |
| 235/40R20 | 27.40" | 9.25" | +1.2% | 60.7 mph | Compare |
| 245/35R20 | 26.75" | 9.65" | −1.2% | 59.3 mph | Compare |
| 315/30R20 | 27.44" | 12.40" | +1.3% | 60.8 mph | Compare |
| 285/30R20 | 26.73" | 11.22" | −1.3% | 59.2 mph | Compare |
| 275/35R20 | 27.58" | 10.83" | +1.8% | 61.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 285/45R17 | 17" | 27.10" | 0.0% | Compare |
| 235/60R16 | 16" | 27.10" | +0.1% | Compare |
| 205/50R19 | 19" | 27.07" | −0.1% | Compare |
| 205/75R15 | 15" | 27.11" | +0.1% | Compare |
| 195/85R14 | 14" | 27.05" | −0.1% | Compare |
| 255/65R14 | 14" | 27.05" | −0.1% | Compare |
| 255/60R15 | 15" | 27.05" | −0.1% | Compare |
| 295/35R19 | 19" | 27.13" | +0.2% | Compare |
| 255/55R16 | 16" | 27.04" | −0.2% | Compare |
| 255/50R17 | 17" | 27.04" | −0.2% | Compare |
| 255/45R18 | 18" | 27.04" | −0.2% | Compare |
| 255/40R19 | 19" | 27.03" | −0.2% | Compare |
One size up or down
- 215/40R20narrower: 26.8" × 8.5"
- 235/40R20wider: 27.4" × 9.3"
- 225/35R20lower profile: 26.2" × 8.9"
- 225/45R20taller sidewall: 28.0" × 8.9"
Compare 225/40R20 with another size
Questions
- How tall is a 225/40R20 tire?
- A 225/40R20 tire is 27.1 inches tall (688 mm), calculated from the size. It is 8.9 inches wide with 3.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 225/40R20 mean?
- 225/40R20 means a tire 225 mm wide, with sidewalls 40% as tall as the tire is wide (90 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 225/40R20 tire make?
- About 745 revolutions per mile, based on a circumference of 85.1 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 225/40R20 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 255/35R20 instead of 225/40R20?
- 255/35R20 is −0.06 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.