305/35R18 tire size in inches
A 305/35R18 tire measures
26.4" tall × 12.0" wide
4.20" sidewall on a 18" wheel. 764 revolutions per mile.
305/35R18 means a tire 305 mm wide, with sidewalls 35% as tall as the tire is wide (107 mm), radial construction (R), for a 18 inch wheel.
305/35R18 specs
| Overall diameter (height) | 26.41 inches (671 mm) |
|---|---|
| Section width | 12.01 inches (305 mm) |
| Sidewall height | 4.20 inches (107 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 83.0 inches (2,107 mm) |
| Revolutions per mile | 764 |
| Revolutions per kilometer | 475 |
| Approximate rim width | 10.0" to 11.5" |
| In inches (flotation style) | 26.4x12.0R18 |
| Aspect ratio | 35% |
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 305/35R18 on a 18" wheel
These 18" sizes are within 3% of 305/35R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 195/55R18 | 26.44" | 7.68" | +0.1% | 60.1 mph | Compare |
| 215/50R18 | 26.46" | 8.46" | +0.2% | 60.1 mph | Compare |
| 265/40R18 | 26.35" | 10.43" | −0.2% | 59.9 mph | Compare |
| 235/45R18 | 26.33" | 9.25" | −0.3% | 59.8 mph | Compare |
| 275/40R18 | 26.66" | 10.83" | +1.0% | 60.6 mph | Compare |
| 245/45R18 | 26.68" | 9.65" | +1.0% | 60.6 mph | Compare |
| 295/35R18 | 26.13" | 11.61" | −1.0% | 59.4 mph | Compare |
| 315/35R18 | 26.68" | 12.40" | +1.0% | 60.6 mph | Compare |
| 205/50R18 | 26.07" | 8.07" | −1.3% | 59.2 mph | Compare |
| 255/40R18 | 26.03" | 10.04" | −1.4% | 59.2 mph | Compare |
| 225/45R18 | 25.97" | 8.86" | −1.6% | 59.0 mph | Compare |
| 225/50R18 | 26.86" | 8.86" | +1.7% | 61.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/70R14 | 14" | 26.40" | 0.0% | Compare |
| 235/40R19 | 19" | 26.40" | 0.0% | Compare |
| 275/25R21 | 21" | 26.41" | 0.0% | Compare |
| 325/25R20 | 20" | 26.40" | 0.0% | Compare |
| 265/45R17 | 17" | 26.39" | −0.1% | Compare |
| 185/85R14 | 14" | 26.38" | −0.1% | Compare |
| 265/50R16 | 16" | 26.43" | +0.1% | Compare |
| 315/30R19 | 19" | 26.44" | +0.1% | Compare |
| 295/45R16 | 16" | 26.45" | +0.2% | Compare |
| 185/65R17 | 17" | 26.47" | +0.2% | Compare |
| 175/75R16 | 16" | 26.33" | −0.3% | Compare |
| 235/35R20 | 20" | 26.48" | +0.3% | Compare |
One size up or down
- 295/35R18narrower: 26.1" × 11.6"
- 315/35R18wider: 26.7" × 12.4"
- 305/40R18taller sidewall: 27.6" × 12.0"
Compare 305/35R18 with another size
Questions
- How tall is a 305/35R18 tire?
- A 305/35R18 tire is 26.4 inches tall (671 mm), calculated from the size. It is 12.0 inches wide with 4.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 305/35R18 mean?
- 305/35R18 means a tire 305 mm wide, with sidewalls 35% as tall as the tire is wide (107 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 305/35R18 tire make?
- About 764 revolutions per mile, based on a circumference of 83.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 305/35R18 tire?
- Roughly 10.0" to 11.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 195/55R18 instead of 305/35R18?
- 195/55R18 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.