245/65R18 tire size in inches
A 245/65R18 tire measures
30.5" tall × 9.6" wide
6.27" sidewall on a 18" wheel. 660 revolutions per mile.
245/65R18 means a tire 245 mm wide, with sidewalls 65% as tall as the tire is wide (159 mm), radial construction (R), for a 18 inch wheel.
245/65R18 specs
| Overall diameter (height) | 30.54 inches (776 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 6.27 inches (159 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 95.9 inches (2,437 mm) |
| Revolutions per mile | 660 |
| Revolutions per kilometer | 410 |
| Approximate rim width | 6.5" to 8.0" |
| In inches (flotation style) | 30.5x9.6R18 |
| Aspect ratio | 65% |
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 245/65R18 on a 18" wheel
These 18" sizes are within 3% of 245/65R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 265/60R18 | 30.52" | 10.43" | −0.1% | 60.0 mph | Compare |
| 225/70R18 | 30.40" | 8.86" | −0.5% | 59.7 mph | Compare |
| 315/50R18 | 30.40" | 12.40" | −0.5% | 59.7 mph | Compare |
| 215/75R18 | 30.70" | 8.46" | +0.5% | 60.3 mph | Compare |
| 285/55R18 | 30.34" | 11.22" | −0.6% | 59.6 mph | Compare |
| 295/55R18 | 30.78" | 11.61" | +0.8% | 60.5 mph | Compare |
| 325/50R18 | 30.80" | 12.80" | +0.8% | 60.5 mph | Compare |
| 235/70R18 | 30.95" | 9.25" | +1.4% | 60.8 mph | Compare |
| 205/75R18 | 30.11" | 8.07" | −1.4% | 59.1 mph | Compare |
| 275/60R18 | 30.99" | 10.83" | +1.5% | 60.9 mph | Compare |
| 255/60R18 | 30.05" | 10.04" | −1.6% | 59.0 mph | Compare |
| 235/65R18 | 30.03" | 9.25" | −1.7% | 59.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 335/40R20 | 20" | 30.55" | 0.0% | Compare |
| 225/65R19 | 19" | 30.52" | −0.1% | Compare |
| 325/45R19 | 19" | 30.52" | −0.1% | Compare |
| 265/65R17 | 17" | 30.56" | +0.1% | Compare |
| 345/35R21 | 21" | 30.51" | −0.1% | Compare |
| 245/70R17 | 17" | 30.50" | −0.1% | Compare |
| 245/60R19 | 19" | 30.57" | +0.1% | Compare |
| 275/30R24 | 24" | 30.50" | −0.1% | Compare |
| 285/65R16 | 16" | 30.59" | +0.2% | Compare |
| 335/25R24 | 24" | 30.59" | +0.2% | Compare |
| 265/55R19 | 19" | 30.48" | −0.2% | Compare |
| 265/70R16 | 16" | 30.61" | +0.2% | Compare |
One size up or down
- 235/65R18narrower: 30.0" × 9.3"
- 255/65R18wider: 31.1" × 10.0"
- 245/60R18lower profile: 29.6" × 9.6"
- 245/70R18taller sidewall: 31.5" × 9.6"
Compare 245/65R18 with another size
Questions
- How tall is a 245/65R18 tire?
- A 245/65R18 tire is 30.5 inches tall (776 mm), calculated from the size. It is 9.6 inches wide with 6.3 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/65R18 mean?
- 245/65R18 means a tire 245 mm wide, with sidewalls 65% as tall as the tire is wide (159 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 245/65R18 tire make?
- About 660 revolutions per mile, based on a circumference of 95.9 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/65R18 tire?
- Roughly 6.5" to 8.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 265/60R18 instead of 245/65R18?
- 265/60R18 is −0.02 inches (−0.1%) in overall diameter, so at an indicated 60 mph you would be doing 60.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.