315/55R20 tire size in inches
A 315/55R20 tire measures
33.6" tall × 12.4" wide
6.82" sidewall on a 20" wheel. 599 revolutions per mile.
315/55R20 means a tire 315 mm wide, with sidewalls 55% as tall as the tire is wide (173 mm), radial construction (R), for a 20 inch wheel.
315/55R20 specs
| Overall diameter (height) | 33.64 inches (855 mm) |
|---|---|
| Section width | 12.40 inches (315 mm) |
| Sidewall height | 6.82 inches (173 mm) |
| Wheel (rim) diameter | 20 inches |
| Circumference | 105.7 inches (2,684 mm) |
| Revolutions per mile | 599 |
| Revolutions per kilometer | 373 |
| Approximate rim width | 9.0" to 10.5" |
| In inches (flotation style) | 33.6x12.4R20 |
| 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 315/55R20 on a 20" wheel
These 20" sizes are within 3% of 315/55R20's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 345/50R20 | 33.58" | 13.58" | −0.2% | 59.9 mph | Compare |
| 265/65R20 | 33.56" | 10.43" | −0.2% | 59.9 mph | Compare |
| 285/60R20 | 33.46" | 11.22" | −0.5% | 59.7 mph | Compare |
| 295/60R20 | 33.94" | 11.61" | +0.9% | 60.5 mph | Compare |
| 355/50R20 | 33.98" | 13.98" | +1.0% | 60.6 mph | Compare |
| 275/65R20 | 34.07" | 10.83" | +1.3% | 60.8 mph | Compare |
| 325/55R20 | 34.07" | 12.80" | +1.3% | 60.8 mph | Compare |
| 305/55R20 | 33.21" | 12.01" | −1.3% | 59.2 mph | Compare |
| 335/50R20 | 33.19" | 13.19" | −1.3% | 59.2 mph | Compare |
| 255/65R20 | 33.05" | 10.04" | −1.8% | 58.9 mph | Compare |
| 33x12.50R20 | 33.00" | 12.50" | −1.9% | 58.9 mph | Compare |
| 275/60R20 | 32.99" | 10.83" | −1.9% | 58.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 265/75R18 | 18" | 33.65" | 0.0% | Compare |
| 295/50R22 | 22" | 33.61" | −0.1% | Compare |
| 305/65R18 | 18" | 33.61" | −0.1% | Compare |
| 305/40R24 | 24" | 33.61" | −0.1% | Compare |
| 285/65R19 | 19" | 33.59" | −0.2% | Compare |
| 355/45R21 | 21" | 33.58" | −0.2% | Compare |
| 285/70R18 | 18" | 33.71" | +0.2% | Compare |
| 265/85R16 | 16" | 33.74" | +0.3% | Compare |
| 325/45R22 | 22" | 33.52" | −0.4% | Compare |
| 295/55R21 | 21" | 33.78" | +0.4% | Compare |
| 335/55R19 | 19" | 33.51" | −0.4% | Compare |
| 345/35R24 | 24" | 33.51" | −0.4% | Compare |
One size up or down
- 305/55R20narrower: 33.2" × 12.0"
- 325/55R20wider: 34.1" × 12.8"
- 315/50R20lower profile: 32.4" × 12.4"
- 315/60R20taller sidewall: 34.9" × 12.4"
Compare 315/55R20 with another size
Questions
- How tall is a 315/55R20 tire?
- A 315/55R20 tire is 33.6 inches tall (855 mm), calculated from the size. It is 12.4 inches wide with 6.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 315/55R20 mean?
- 315/55R20 means a tire 315 mm wide, with sidewalls 55% as tall as the tire is wide (173 mm), radial construction (R), for a 20 inch wheel.
- How many revolutions per mile does a 315/55R20 tire make?
- About 599 revolutions per mile, based on a circumference of 105.7 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 315/55R20 tire?
- Roughly 9.0" to 10.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 345/50R20 instead of 315/55R20?
- 345/50R20 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.