215/65R18 tire size in inches
A 215/65R18 tire measures
29.0" tall × 8.5" wide
5.50" sidewall on a 18" wheel. 695 revolutions per mile.
215/65R18 means a tire 215 mm wide, with sidewalls 65% as tall as the tire is wide (140 mm), radial construction (R), for a 18 inch wheel.
215/65R18 specs
| Overall diameter (height) | 29.00 inches (737 mm) |
|---|---|
| Section width | 8.46 inches (215 mm) |
| Sidewall height | 5.50 inches (140 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 91.1 inches (2,314 mm) |
| Revolutions per mile | 695 |
| Revolutions per kilometer | 432 |
| Approximate rim width | 5.5" to 7.0" |
| In inches (flotation style) | 29.0x8.5R18 |
| 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 215/65R18 on a 18" wheel
These 18" sizes are within 3% of 215/65R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 255/55R18 | 29.04" | 10.04" | +0.1% | 60.1 mph | Compare |
| 235/60R18 | 29.10" | 9.25" | +0.3% | 60.2 mph | Compare |
| 315/45R18 | 29.16" | 12.40" | +0.5% | 60.3 mph | Compare |
| 275/50R18 | 28.83" | 10.83" | −0.6% | 59.6 mph | Compare |
| 305/45R18 | 28.81" | 12.01" | −0.7% | 59.6 mph | Compare |
| 285/50R18 | 29.22" | 11.22" | +0.7% | 60.4 mph | Compare |
| 195/70R18 | 28.75" | 7.68" | −0.9% | 59.5 mph | Compare |
| 205/70R18 | 29.30" | 8.07" | +1.0% | 60.6 mph | Compare |
| 225/60R18 | 28.63" | 8.86" | −1.3% | 59.2 mph | Compare |
| 245/55R18 | 28.61" | 9.65" | −1.4% | 59.2 mph | Compare |
| 335/40R18 | 28.55" | 13.19" | −1.6% | 59.1 mph | Compare |
| 265/55R18 | 29.48" | 10.43" | +1.6% | 61.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 305/50R17 | 17" | 29.01" | 0.0% | Compare |
| 275/60R16 | 16" | 28.99" | 0.0% | Compare |
| 255/25R24 | 24" | 29.02" | +0.1% | Compare |
| 355/25R22 | 22" | 28.99" | −0.1% | Compare |
| 235/65R17 | 17" | 29.03" | +0.1% | Compare |
| 255/35R22 | 22" | 29.03" | +0.1% | Compare |
| 255/40R21 | 21" | 29.03" | +0.1% | Compare |
| 285/40R20 | 20" | 28.98" | −0.1% | Compare |
| 225/45R21 | 21" | 28.97" | −0.1% | Compare |
| 255/45R20 | 20" | 29.04" | +0.1% | Compare |
| 255/50R19 | 19" | 29.04" | +0.1% | Compare |
| 295/30R22 | 22" | 28.97" | −0.1% | Compare |
One size up or down
- 205/65R18narrower: 28.5" × 8.1"
- 225/65R18wider: 29.5" × 8.9"
- 215/60R18lower profile: 28.2" × 8.5"
- 215/70R18taller sidewall: 29.9" × 8.5"
Compare 215/65R18 with another size
Questions
- How tall is a 215/65R18 tire?
- A 215/65R18 tire is 29.0 inches tall (737 mm), calculated from the size. It is 8.5 inches wide with 5.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 215/65R18 mean?
- 215/65R18 means a tire 215 mm wide, with sidewalls 65% as tall as the tire is wide (140 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 215/65R18 tire make?
- About 695 revolutions per mile, based on a circumference of 91.1 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 215/65R18 tire?
- Roughly 5.5" to 7.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 255/55R18 instead of 215/65R18?
- 255/55R18 is +0.04 inches (+0.1%) 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.