345/55R20 tire size in inches
A 345/55R20 tire measures
34.9" tall × 13.6" wide
7.47" sidewall on a 20" wheel. 577 revolutions per mile.
345/55R20 means a tire 345 mm wide, with sidewalls 55% as tall as the tire is wide (190 mm), radial construction (R), for a 20 inch wheel.
345/55R20 specs
| Overall diameter (height) | 34.94 inches (887 mm) |
|---|---|
| Section width | 13.58 inches (345 mm) |
| Sidewall height | 7.47 inches (190 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 109.8 inches (2,788 mm) |
| Revolutions per mile | 577 |
| Revolutions per kilometer | 359 |
| Approximate rim width | 10.0" to 11.5" |
| In inches (flotation style) | 34.9x13.6R20 |
| Aspect ratio | 55% |
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 345/55R20 on a 20" wheel
These 20" sizes are within 3% of 345/55R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 315/60R20 | 34.88" | 12.40" | −0.2% | 59.9 mph | Compare |
| 35x12.50R20 | 35.00" | 12.50" | +0.2% | 60.1 mph | Compare |
| 295/65R20 | 35.10" | 11.61" | +0.5% | 60.3 mph | Compare |
| 285/65R20 | 34.59" | 11.22" | −1.0% | 59.4 mph | Compare |
| 325/60R20 | 35.35" | 12.80" | +1.2% | 60.7 mph | Compare |
| 335/55R20 | 34.51" | 13.19" | −1.2% | 59.3 mph | Compare |
| 355/55R20 | 35.37" | 13.98" | +1.2% | 60.7 mph | Compare |
| 305/60R20 | 34.41" | 12.01" | −1.5% | 59.1 mph | Compare |
| 305/65R20 | 35.61" | 12.01" | +1.9% | 61.1 mph | Compare |
| 275/65R20 | 34.07" | 10.83" | −2.5% | 58.5 mph | Compare |
| 325/55R20 | 34.07" | 12.80" | −2.5% | 58.5 mph | Compare |
| 335/60R20 | 35.83" | 13.19" | +2.5% | 61.5 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 355/50R21 | 21" | 34.98" | +0.1% | Compare |
| 35x12.50R15 | 15" | 35.00" | +0.2% | Compare |
| 35x12.50R17 | 17" | 35.00" | +0.2% | Compare |
| 35x12.50R18 | 18" | 35.00" | +0.2% | Compare |
| 35x12.50R22 | 22" | 35.00" | +0.2% | Compare |
| 35x12.50R24 | 24" | 35.00" | +0.2% | Compare |
| 305/75R17 | 17" | 35.01" | +0.2% | Compare |
| 345/40R24 | 24" | 34.87" | −0.2% | Compare |
| 285/75R18 | 18" | 34.83" | −0.3% | Compare |
| 335/60R19 | 19" | 34.83" | −0.3% | Compare |
| 305/70R18 | 18" | 34.81" | −0.4% | Compare |
| 285/85R16 | 16" | 35.07" | +0.4% | Compare |
One size up or down
Compare 345/55R20 with another size
Questions
- How tall is a 345/55R20 tire?
- A 345/55R20 tire is 34.9 inches tall (887 mm), calculated from the size. It is 13.6 inches wide with 7.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 345/55R20 mean?
- 345/55R20 means a tire 345 mm wide, with sidewalls 55% as tall as the tire is wide (190 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 345/55R20 tire make?
- About 577 revolutions per mile, based on a circumference of 109.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 345/55R20 tire?
- Roughly 10.0" to 11.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 315/60R20 instead of 345/55R20?
- 315/60R20 is −0.06 inches (−0.2%) in overall diameter, so at an indicated 60 mph you would be doing 59.9 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.