235/40R20 tire size in inches
A 235/40R20 tire measures
27.4" tall × 9.3" wide
3.70" sidewall on a 20" wheel. 736 revolutions per mile.
235/40R20 means a tire 235 mm wide, with sidewalls 40% as tall as the tire is wide (94 mm), radial construction (R), for a 20 inch wheel.
235/40R20 specs
| Overall diameter (height) | 27.40 inches (696 mm) |
|---|---|
| Section width | 9.25 inches (235 mm) |
| Sidewall height | 3.70 inches (94 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 86.1 inches (2,187 mm) |
| Revolutions per mile | 736 |
| Revolutions per kilometer | 457 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 27.4x9.3R20 |
| 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 235/40R20 on a 20" wheel
These 20" sizes are within 3% of 235/40R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 315/30R20 | 27.44" | 12.40" | +0.1% | 60.1 mph | Compare |
| 265/35R20 | 27.30" | 10.43" | −0.4% | 59.8 mph | Compare |
| 275/35R20 | 27.58" | 10.83" | +0.6% | 60.4 mph | Compare |
| 305/30R20 | 27.20" | 12.01" | −0.7% | 59.6 mph | Compare |
| 215/45R20 | 27.62" | 8.46" | +0.8% | 60.5 mph | Compare |
| 325/30R20 | 27.68" | 12.80" | +1.0% | 60.6 mph | Compare |
| 225/40R20 | 27.09" | 8.86" | −1.1% | 59.3 mph | Compare |
| 245/40R20 | 27.72" | 9.65" | +1.1% | 60.7 mph | Compare |
| 255/35R20 | 27.03" | 10.04" | −1.4% | 59.2 mph | Compare |
| 355/25R20 | 26.99" | 13.98" | −1.5% | 59.1 mph | Compare |
| 295/30R20 | 26.97" | 11.61" | −1.6% | 59.1 mph | Compare |
| 285/35R20 | 27.85" | 11.22" | +1.7% | 61.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/70R15 | 15" | 27.40" | 0.0% | Compare |
| 305/35R19 | 19" | 27.41" | 0.0% | Compare |
| 325/25R21 | 21" | 27.40" | 0.0% | Compare |
| 275/25R22 | 22" | 27.41" | 0.0% | Compare |
| 215/85R13 | 13" | 27.39" | 0.0% | Compare |
| 265/45R18 | 18" | 27.39" | 0.0% | Compare |
| 355/30R19 | 19" | 27.39" | −0.1% | Compare |
| 185/85R15 | 15" | 27.38" | −0.1% | Compare |
| 265/50R17 | 17" | 27.43" | +0.1% | Compare |
| 295/45R17 | 17" | 27.45" | +0.2% | Compare |
| 265/40R19 | 19" | 27.35" | −0.2% | Compare |
| 285/55R15 | 15" | 27.34" | −0.2% | Compare |
One size up or down
- 225/40R20narrower: 27.1" × 8.9"
- 245/40R20wider: 27.7" × 9.6"
- 235/35R20lower profile: 26.5" × 9.3"
- 235/45R20taller sidewall: 28.3" × 9.3"
Compare 235/40R20 with another size
Questions
- How tall is a 235/40R20 tire?
- A 235/40R20 tire is 27.4 inches tall (696 mm), calculated from the size. It is 9.3 inches wide with 3.7 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 235/40R20 mean?
- 235/40R20 means a tire 235 mm wide, with sidewalls 40% as tall as the tire is wide (94 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 235/40R20 tire make?
- About 736 revolutions per mile, based on a circumference of 86.1 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 235/40R20 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 315/30R20 instead of 235/40R20?
- 315/30R20 is +0.04 inches (+0.1%) 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.