315/60R18 tire size in inches
A 315/60R18 tire measures
32.9" tall × 12.4" wide
7.44" sidewall on a 18" wheel. 613 revolutions per mile.
315/60R18 means a tire 315 mm wide, with sidewalls 60% as tall as the tire is wide (189 mm), radial construction (R), for a 18 inch wheel.
315/60R18 specs
| Overall diameter (height) | 32.88 inches (835 mm) |
|---|---|
| Section width | 12.40 inches (315 mm) |
| Sidewall height | 7.44 inches (189 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 103.3 inches (2,624 mm) |
| Revolutions per mile | 613 |
| Revolutions per kilometer | 381 |
| Approximate rim width | 8.5" to 10.0" |
| In inches (flotation style) | 32.9x12.4R18 |
| Aspect ratio | 60% |
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 315/60R18 on a 18" wheel
These 18" sizes are within 3% of 315/60R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 33x12.50R18 | 33.00" | 12.50" | +0.4% | 60.2 mph | Compare |
| 255/75R18 | 33.06" | 10.04" | +0.5% | 60.3 mph | Compare |
| 295/65R18 | 33.10" | 11.61" | +0.7% | 60.4 mph | Compare |
| 265/70R18 | 32.61" | 10.43" | −0.8% | 59.5 mph | Compare |
| 275/70R18 | 33.16" | 10.83" | +0.8% | 60.5 mph | Compare |
| 285/65R18 | 32.59" | 11.22" | −0.9% | 59.5 mph | Compare |
| 335/55R18 | 32.51" | 13.19" | −1.1% | 59.3 mph | Compare |
| 245/75R18 | 32.47" | 9.65" | −1.3% | 59.2 mph | Compare |
| 305/60R18 | 32.41" | 12.01" | −1.4% | 59.1 mph | Compare |
| 325/60R18 | 33.35" | 12.80" | +1.4% | 60.9 mph | Compare |
| 305/65R18 | 33.61" | 12.01" | +2.2% | 61.3 mph | Compare |
| 265/75R18 | 33.65" | 10.43" | +2.3% | 61.4 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 335/45R21 | 21" | 32.87" | 0.0% | Compare |
| 345/40R22 | 22" | 32.87" | 0.0% | Compare |
| 275/55R21 | 21" | 32.91" | +0.1% | Compare |
| 285/75R16 | 16" | 32.83" | −0.2% | Compare |
| 275/50R22 | 22" | 32.83" | −0.2% | Compare |
| 295/60R19 | 19" | 32.94" | +0.2% | Compare |
| 285/80R15 | 15" | 32.95" | +0.2% | Compare |
| 305/45R22 | 22" | 32.81" | −0.2% | Compare |
| 325/35R24 | 24" | 32.96" | +0.2% | Compare |
| 325/50R20 | 20" | 32.80" | −0.3% | Compare |
| 285/40R24 | 24" | 32.98" | +0.3% | Compare |
| 355/50R19 | 19" | 32.98" | +0.3% | Compare |
One size up or down
- 305/60R18narrower: 32.4" × 12.0"
- 325/60R18wider: 33.4" × 12.8"
- 315/55R18lower profile: 31.6" × 12.4"
- 315/65R18taller sidewall: 34.1" × 12.4"
Compare 315/60R18 with another size
Questions
- How tall is a 315/60R18 tire?
- A 315/60R18 tire is 32.9 inches tall (835 mm), calculated from the size. It is 12.4 inches wide with 7.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 315/60R18 mean?
- 315/60R18 means a tire 315 mm wide, with sidewalls 60% as tall as the tire is wide (189 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 315/60R18 tire make?
- About 613 revolutions per mile, based on a circumference of 103.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 315/60R18 tire?
- Roughly 8.5" to 10.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 33x12.50R18 instead of 315/60R18?
- 33x12.50R18 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.