305/60R18 tire size in inches
A 305/60R18 tire measures
32.4" tall × 12.0" wide
7.20" sidewall on a 18" wheel. 622 revolutions per mile.
305/60R18 means a tire 305 mm wide, with sidewalls 60% as tall as the tire is wide (183 mm), radial construction (R), for a 18 inch wheel.
305/60R18 specs
| Overall diameter (height) | 32.41 inches (823 mm) |
|---|---|
| Section width | 12.01 inches (305 mm) |
| Sidewall height | 7.20 inches (183 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 101.8 inches (2,586 mm) |
| Revolutions per mile | 622 |
| Revolutions per kilometer | 387 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 32.4x12.0R18 |
| 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 305/60R18 on a 18" wheel
These 18" sizes are within 3% of 305/60R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 245/75R18 | 32.47" | 9.65" | +0.2% | 60.1 mph | Compare |
| 335/55R18 | 32.51" | 13.19" | +0.3% | 60.2 mph | Compare |
| 285/65R18 | 32.59" | 11.22" | +0.5% | 60.3 mph | Compare |
| 265/70R18 | 32.61" | 10.43" | +0.6% | 60.4 mph | Compare |
| 275/65R18 | 32.07" | 10.83" | −1.0% | 59.4 mph | Compare |
| 325/55R18 | 32.07" | 12.80" | −1.0% | 59.4 mph | Compare |
| 255/70R18 | 32.06" | 10.04" | −1.1% | 59.3 mph | Compare |
| 295/60R18 | 31.94" | 11.61" | −1.5% | 59.1 mph | Compare |
| 315/60R18 | 32.88" | 12.40" | +1.5% | 60.9 mph | Compare |
| 235/75R18 | 31.88" | 9.25" | −1.6% | 59.0 mph | Compare |
| 33x12.50R18 | 33.00" | 12.50" | +1.8% | 61.1 mph | Compare |
| 255/75R18 | 33.06" | 10.04" | +2.0% | 61.2 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 305/35R24 | 24" | 32.41" | 0.0% | Compare |
| 315/50R20 | 20" | 32.40" | 0.0% | Compare |
| 245/85R16 | 16" | 32.40" | 0.0% | Compare |
| 265/50R22 | 22" | 32.43" | +0.1% | Compare |
| 355/30R24 | 24" | 32.39" | −0.1% | Compare |
| 295/45R22 | 22" | 32.45" | +0.1% | Compare |
| 285/60R19 | 19" | 32.46" | +0.2% | Compare |
| 265/40R24 | 24" | 32.35" | −0.2% | Compare |
| 265/55R21 | 21" | 32.48" | +0.2% | Compare |
| 285/55R20 | 20" | 32.34" | −0.2% | Compare |
| 275/80R15 | 15" | 32.32" | −0.3% | Compare |
| 325/45R21 | 21" | 32.52" | +0.3% | Compare |
One size up or down
- 295/60R18narrower: 31.9" × 11.6"
- 315/60R18wider: 32.9" × 12.4"
- 305/55R18lower profile: 31.2" × 12.0"
- 305/65R18taller sidewall: 33.6" × 12.0"
Compare 305/60R18 with another size
Questions
- How tall is a 305/60R18 tire?
- A 305/60R18 tire is 32.4 inches tall (823 mm), calculated from the size. It is 12.0 inches wide with 7.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 305/60R18 mean?
- 305/60R18 means a tire 305 mm wide, with sidewalls 60% as tall as the tire is wide (183 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 305/60R18 tire make?
- About 622 revolutions per mile, based on a circumference of 101.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 305/60R18 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 245/75R18 instead of 305/60R18?
- 245/75R18 is +0.06 inches (+0.2%) in overall diameter, so at an indicated 60 mph you would be doing 60.1 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.