245/30R20 tire size in inches
A 245/30R20 tire measures
25.8" tall × 9.6" wide
2.89" sidewall on a 20" wheel. 782 revolutions per mile.
245/30R20 means a tire 245 mm wide, with sidewalls 30% as tall as the tire is wide (74 mm), radial construction (R), for a 20 inch wheel.
245/30R20 specs
| Overall diameter (height) | 25.79 inches (655 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 2.89 inches (74 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 81.0 inches (2,058 mm) |
| Revolutions per mile | 782 |
| Revolutions per kilometer | 486 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 25.8x9.6R20 |
| 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 245/30R20 on a 20" wheel
These 20" sizes are within 3% of 245/30R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 295/25R20 | 25.81" | 11.61" | +0.1% | 60.0 mph | Compare |
| 215/35R20 | 25.93" | 8.46" | +0.5% | 60.3 mph | Compare |
| 285/25R20 | 25.61" | 11.22" | −0.7% | 59.6 mph | Compare |
| 305/25R20 | 26.00" | 12.01" | +0.8% | 60.5 mph | Compare |
| 235/30R20 | 25.55" | 9.25" | −0.9% | 59.5 mph | Compare |
| 255/30R20 | 26.02" | 10.04" | +0.9% | 60.5 mph | Compare |
| 275/25R20 | 25.41" | 10.83" | −1.5% | 59.1 mph | Compare |
| 225/35R20 | 26.20" | 8.86" | +1.6% | 61.0 mph | Compare |
| 315/25R20 | 26.20" | 12.40" | +1.6% | 61.0 mph | Compare |
| 225/30R20 | 25.31" | 8.86" | −1.8% | 58.9 mph | Compare |
| 265/30R20 | 26.26" | 10.43" | +1.8% | 61.1 mph | Compare |
| 265/25R20 | 25.22" | 10.43" | −2.2% | 58.7 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 345/25R19 | 19" | 25.79" | 0.0% | Compare |
| 215/40R19 | 19" | 25.77" | −0.1% | Compare |
| 245/35R19 | 19" | 25.75" | −0.1% | Compare |
| 245/25R21 | 21" | 25.82" | +0.1% | Compare |
| 195/70R15 | 15" | 25.75" | −0.2% | Compare |
| 275/50R15 | 15" | 25.83" | +0.2% | Compare |
| 225/55R16 | 16" | 25.74" | −0.2% | Compare |
| 275/45R16 | 16" | 25.74" | −0.2% | Compare |
| 185/60R17 | 17" | 25.74" | −0.2% | Compare |
| 285/30R19 | 19" | 25.73" | −0.2% | Compare |
| 215/70R14 | 14" | 25.85" | +0.2% | Compare |
| 285/35R18 | 18" | 25.85" | +0.3% | Compare |
One size up or down
- 235/30R20narrower: 25.6" × 9.3"
- 255/30R20wider: 26.0" × 10.0"
- 245/25R20lower profile: 24.8" × 9.6"
- 245/35R20taller sidewall: 26.8" × 9.6"
Compare 245/30R20 with another size
Questions
- How tall is a 245/30R20 tire?
- A 245/30R20 tire is 25.8 inches tall (655 mm), calculated from the size. It is 9.6 inches wide with 2.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/30R20 mean?
- 245/30R20 means a tire 245 mm wide, with sidewalls 30% as tall as the tire is wide (74 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 245/30R20 tire make?
- About 782 revolutions per mile, based on a circumference of 81.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/30R20 tire?
- Roughly 8.0" to 9.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 295/25R20 instead of 245/30R20?
- 295/25R20 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.