235/30R20 tire size in inches
A 235/30R20 tire measures
25.6" tall × 9.3" wide
2.78" sidewall on a 20" wheel. 789 revolutions per mile.
235/30R20 means a tire 235 mm wide, with sidewalls 30% as tall as the tire is wide (71 mm), radial construction (R), for a 20 inch wheel.
235/30R20 specs
| Overall diameter (height) | 25.55 inches (649 mm) |
|---|---|
| Section width | 9.25 inches (235 mm) |
| Sidewall height | 2.78 inches (71 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 80.3 inches (2,039 mm) |
| Revolutions per mile | 789 |
| Revolutions per kilometer | 490 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 25.6x9.3R20 |
| Aspect ratio | 30% |
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 235/30R20 on a 20" wheel
These 20" sizes are within 3% of 235/30R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 285/25R20 | 25.61" | 11.22" | +0.2% | 60.1 mph | Compare |
| 275/25R20 | 25.41" | 10.83" | −0.5% | 59.7 mph | Compare |
| 225/30R20 | 25.31" | 8.86" | −0.9% | 59.4 mph | Compare |
| 245/30R20 | 25.79" | 9.65" | +0.9% | 60.6 mph | Compare |
| 295/25R20 | 25.81" | 11.61" | +1.0% | 60.6 mph | Compare |
| 265/25R20 | 25.22" | 10.43" | −1.3% | 59.2 mph | Compare |
| 215/35R20 | 25.93" | 8.46" | +1.5% | 60.9 mph | Compare |
| 305/25R20 | 26.00" | 12.01" | +1.8% | 61.1 mph | Compare |
| 215/30R20 | 25.08" | 8.46" | −1.8% | 58.9 mph | Compare |
| 255/30R20 | 26.02" | 10.04" | +1.8% | 61.1 mph | Compare |
| 255/25R20 | 25.02" | 10.04" | −2.1% | 58.8 mph | Compare |
| 225/35R20 | 26.20" | 8.86" | +2.5% | 61.5 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 245/65R13 | 13" | 25.54" | 0.0% | Compare |
| 245/60R14 | 14" | 25.57" | +0.1% | Compare |
| 275/35R18 | 18" | 25.58" | +0.1% | Compare |
| 195/75R14 | 14" | 25.52" | −0.1% | Compare |
| 225/65R14 | 14" | 25.52" | −0.1% | Compare |
| 335/25R19 | 19" | 25.59" | +0.2% | Compare |
| 275/30R19 | 19" | 25.50" | −0.2% | Compare |
| 205/65R15 | 15" | 25.49" | −0.2% | Compare |
| 245/55R15 | 15" | 25.61" | +0.2% | Compare |
| 215/45R18 | 18" | 25.62" | +0.3% | Compare |
| 235/35R19 | 19" | 25.48" | −0.3% | Compare |
| 235/25R21 | 21" | 25.63" | +0.3% | Compare |
One size up or down
- 225/30R20narrower: 25.3" × 8.9"
- 245/30R20wider: 25.8" × 9.6"
- 235/25R20lower profile: 24.6" × 9.3"
- 235/35R20taller sidewall: 26.5" × 9.3"
Compare 235/30R20 with another size
Questions
- How tall is a 235/30R20 tire?
- A 235/30R20 tire is 25.6 inches tall (649 mm), calculated from the size. It is 9.3 inches wide with 2.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 235/30R20 mean?
- 235/30R20 means a tire 235 mm wide, with sidewalls 30% as tall as the tire is wide (71 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 235/30R20 tire make?
- About 789 revolutions per mile, based on a circumference of 80.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 235/30R20 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 285/25R20 instead of 235/30R20?
- 285/25R20 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.