205/65R18 tire size in inches
A 205/65R18 tire measures
28.5" tall × 8.1" wide
5.25" sidewall on a 18" wheel. 708 revolutions per mile.
205/65R18 means a tire 205 mm wide, with sidewalls 65% as tall as the tire is wide (133 mm), radial construction (R), for a 18 inch wheel.
205/65R18 specs
| Overall diameter (height) | 28.49 inches (724 mm) |
|---|---|
| Section width | 8.07 inches (205 mm) |
| Sidewall height | 5.25 inches (133 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 89.5 inches (2,274 mm) |
| Revolutions per mile | 708 |
| Revolutions per kilometer | 440 |
| Approximate rim width | 5.5" to 7.0" |
| In inches (flotation style) | 28.5x8.1R18 |
| 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 205/65R18 on a 18" wheel
These 18" sizes are within 3% of 205/65R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 295/45R18 | 28.45" | 11.61" | −0.1% | 59.9 mph | Compare |
| 265/50R18 | 28.43" | 10.43" | −0.2% | 59.9 mph | Compare |
| 335/40R18 | 28.55" | 13.19" | +0.2% | 60.1 mph | Compare |
| 245/55R18 | 28.61" | 9.65" | +0.4% | 60.2 mph | Compare |
| 225/60R18 | 28.63" | 8.86" | +0.5% | 60.3 mph | Compare |
| 195/70R18 | 28.75" | 7.68" | +0.9% | 60.5 mph | Compare |
| 325/40R18 | 28.24" | 12.80" | −0.9% | 59.5 mph | Compare |
| 235/55R18 | 28.18" | 9.25" | −1.1% | 59.3 mph | Compare |
| 305/45R18 | 28.81" | 12.01" | +1.1% | 60.7 mph | Compare |
| 275/50R18 | 28.83" | 10.83" | +1.2% | 60.7 mph | Compare |
| 215/60R18 | 28.16" | 8.46" | −1.2% | 59.3 mph | Compare |
| 285/45R18 | 28.10" | 11.22" | −1.4% | 59.2 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 275/30R22 | 22" | 28.50" | 0.0% | Compare |
| 245/70R15 | 15" | 28.50" | 0.0% | Compare |
| 345/35R19 | 19" | 28.51" | +0.1% | Compare |
| 235/35R22 | 22" | 28.48" | −0.1% | Compare |
| 265/55R17 | 17" | 28.48" | −0.1% | Compare |
| 195/75R17 | 17" | 28.52" | +0.1% | Compare |
| 225/65R17 | 17" | 28.52" | +0.1% | Compare |
| 245/75R14 | 14" | 28.47" | −0.1% | Compare |
| 215/50R20 | 20" | 28.46" | −0.1% | Compare |
| 265/60R16 | 16" | 28.52" | +0.1% | Compare |
| 285/60R15 | 15" | 28.46" | −0.1% | Compare |
| 245/65R16 | 16" | 28.54" | +0.2% | Compare |
One size up or down
- 195/65R18narrower: 28.0" × 7.7"
- 215/65R18wider: 29.0" × 8.5"
- 205/60R18lower profile: 27.7" × 8.1"
- 205/70R18taller sidewall: 29.3" × 8.1"
Compare 205/65R18 with another size
Questions
- How tall is a 205/65R18 tire?
- A 205/65R18 tire is 28.5 inches tall (724 mm), calculated from the size. It is 8.1 inches wide with 5.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 205/65R18 mean?
- 205/65R18 means a tire 205 mm wide, with sidewalls 65% as tall as the tire is wide (133 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 205/65R18 tire make?
- About 708 revolutions per mile, based on a circumference of 89.5 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 205/65R18 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 295/45R18 instead of 205/65R18?
- 295/45R18 is −0.04 inches (−0.1%) 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.