235/45R20 tire size in inches
A 235/45R20 tire measures
28.3" tall × 9.3" wide
4.16" sidewall on a 20" wheel. 712 revolutions per mile.
235/45R20 means a tire 235 mm wide, with sidewalls 45% as tall as the tire is wide (106 mm), radial construction (R), for a 20 inch wheel.
235/45R20 specs
| Overall diameter (height) | 28.33 inches (720 mm) |
|---|---|
| Section width | 9.25 inches (235 mm) |
| Sidewall height | 4.16 inches (106 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 89.0 inches (2,260 mm) |
| Revolutions per mile | 712 |
| Revolutions per kilometer | 442 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 28.3x9.3R20 |
| 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 235/45R20 on a 20" wheel
These 20" sizes are within 3% of 235/45R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 265/40R20 | 28.35" | 10.43" | +0.1% | 60.0 mph | Compare |
| 355/30R20 | 28.39" | 13.98" | +0.2% | 60.1 mph | Compare |
| 305/35R20 | 28.41" | 12.01" | +0.3% | 60.2 mph | Compare |
| 215/50R20 | 28.46" | 8.46" | +0.5% | 60.3 mph | Compare |
| 345/30R20 | 28.15" | 13.58" | −0.6% | 59.6 mph | Compare |
| 295/35R20 | 28.13" | 11.61" | −0.7% | 59.6 mph | Compare |
| 255/40R20 | 28.03" | 10.04" | −1.0% | 59.4 mph | Compare |
| 275/40R20 | 28.66" | 10.83" | +1.2% | 60.7 mph | Compare |
| 225/45R20 | 27.97" | 8.86" | −1.3% | 59.2 mph | Compare |
| 245/45R20 | 28.68" | 9.65" | +1.3% | 60.8 mph | Compare |
| 315/35R20 | 28.68" | 12.40" | +1.3% | 60.8 mph | Compare |
| 335/30R20 | 27.91" | 13.19" | −1.5% | 59.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 215/55R19 | 19" | 28.31" | −0.1% | Compare |
| 285/55R16 | 16" | 28.34" | +0.1% | Compare |
| 265/35R21 | 21" | 28.30" | −0.1% | Compare |
| 205/70R17 | 17" | 28.30" | −0.1% | Compare |
| 295/40R19 | 19" | 28.29" | −0.1% | Compare |
| 225/75R15 | 15" | 28.29" | −0.1% | Compare |
| 195/80R16 | 16" | 28.28" | −0.2% | Compare |
| 185/85R16 | 16" | 28.38" | +0.2% | Compare |
| 215/85R14 | 14" | 28.39" | +0.2% | Compare |
| 265/45R19 | 19" | 28.39" | +0.2% | Compare |
| 265/30R22 | 22" | 28.26" | −0.2% | Compare |
| 325/25R22 | 22" | 28.40" | +0.3% | Compare |
One size up or down
- 225/45R20narrower: 28.0" × 8.9"
- 245/45R20wider: 28.7" × 9.6"
- 235/40R20lower profile: 27.4" × 9.3"
- 235/50R20taller sidewall: 29.3" × 9.3"
Compare 235/45R20 with another size
Questions
- How tall is a 235/45R20 tire?
- A 235/45R20 tire is 28.3 inches tall (720 mm), calculated from the size. It is 9.3 inches wide with 4.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 235/45R20 mean?
- 235/45R20 means a tire 235 mm wide, with sidewalls 45% as tall as the tire is wide (106 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 235/45R20 tire make?
- About 712 revolutions per mile, based on a circumference of 89.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 235/45R20 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 265/40R20 instead of 235/45R20?
- 265/40R20 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.