345/45R20 tire size in inches
A 345/45R20 tire measures
32.2" tall × 13.6" wide
6.11" sidewall on a 20" wheel. 626 revolutions per mile.
345/45R20 means a tire 345 mm wide, with sidewalls 45% as tall as the tire is wide (155 mm), radial construction (R), for a 20 inch wheel.
345/45R20 specs
| Overall diameter (height) | 32.22 inches (818 mm) |
|---|---|
| Section width | 13.58 inches (345 mm) |
| Sidewall height | 6.11 inches (155 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 101.2 inches (2,571 mm) |
| Revolutions per mile | 626 |
| Revolutions per kilometer | 389 |
| Approximate rim width | 11.5" to 13.0" |
| In inches (flotation style) | 32.2x13.6R20 |
| 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 345/45R20 on a 20" wheel
These 20" sizes are within 3% of 345/45R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 285/55R20 | 32.34" | 11.22" | +0.4% | 60.2 mph | Compare |
| 255/60R20 | 32.05" | 10.04" | −0.5% | 59.7 mph | Compare |
| 315/50R20 | 32.40" | 12.40" | +0.5% | 60.3 mph | Compare |
| 235/65R20 | 32.03" | 9.25" | −0.6% | 59.6 mph | Compare |
| 305/50R20 | 32.01" | 12.01" | −0.7% | 59.6 mph | Compare |
| 265/60R20 | 32.52" | 10.43" | +0.9% | 60.5 mph | Compare |
| 245/65R20 | 32.54" | 9.65" | +1.0% | 60.6 mph | Compare |
| 275/55R20 | 31.91" | 10.83" | −1.0% | 59.4 mph | Compare |
| 335/45R20 | 31.87" | 13.19" | −1.1% | 59.3 mph | Compare |
| 355/45R20 | 32.58" | 13.98" | +1.1% | 60.7 mph | Compare |
| 295/55R20 | 32.78" | 11.61" | +1.7% | 61.0 mph | Compare |
| 325/50R20 | 32.80" | 12.80" | +1.8% | 61.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 285/50R21 | 21" | 32.22" | 0.0% | Compare |
| 325/40R22 | 22" | 32.24" | 0.0% | Compare |
| 305/55R19 | 19" | 32.21" | 0.0% | Compare |
| 275/75R16 | 16" | 32.24" | 0.0% | Compare |
| 295/70R16 | 16" | 32.26" | +0.1% | Compare |
| 335/50R19 | 19" | 32.19" | −0.1% | Compare |
| 355/40R21 | 21" | 32.18" | −0.1% | Compare |
| 235/55R22 | 22" | 32.18" | −0.1% | Compare |
| 315/45R21 | 21" | 32.16" | −0.2% | Compare |
| 275/70R17 | 17" | 32.16" | −0.2% | Compare |
| 345/30R24 | 24" | 32.15" | −0.2% | Compare |
| 295/35R24 | 24" | 32.13" | −0.3% | Compare |
One size up or down
- 335/45R20narrower: 31.9" × 13.2"
- 355/45R20wider: 32.6" × 14.0"
- 345/40R20lower profile: 30.9" × 13.6"
- 345/50R20taller sidewall: 33.6" × 13.6"
Compare 345/45R20 with another size
Questions
- How tall is a 345/45R20 tire?
- A 345/45R20 tire is 32.2 inches tall (818 mm), calculated from the size. It is 13.6 inches wide with 6.1 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 345/45R20 mean?
- 345/45R20 means a tire 345 mm wide, with sidewalls 45% as tall as the tire is wide (155 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 345/45R20 tire make?
- About 626 revolutions per mile, based on a circumference of 101.2 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 345/45R20 tire?
- Roughly 11.5" to 13.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 285/55R20 instead of 345/45R20?
- 285/55R20 is +0.12 inches (+0.4%) in overall diameter, so at an indicated 60 mph you would be doing 60.2 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.