245/35R18 tire size in inches
A 245/35R18 tire measures
24.8" tall × 9.6" wide
3.38" sidewall on a 18" wheel. 815 revolutions per mile.
245/35R18 means a tire 245 mm wide, with sidewalls 35% as tall as the tire is wide (86 mm), radial construction (R), for a 18 inch wheel.
245/35R18 specs
| Overall diameter (height) | 24.75 inches (629 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 3.38 inches (86 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 77.8 inches (1,975 mm) |
| Revolutions per mile | 815 |
| Revolutions per kilometer | 506 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 24.8x9.6R18 |
| 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 245/35R18 on a 18" wheel
These 18" sizes are within 3% of 245/35R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 215/40R18 | 24.77" | 8.46" | +0.1% | 60.0 mph | Compare |
| 195/45R18 | 24.91" | 7.68" | +0.6% | 60.4 mph | Compare |
| 235/35R18 | 24.48" | 9.25" | −1.1% | 59.3 mph | Compare |
| 255/35R18 | 25.03" | 10.04" | +1.1% | 60.7 mph | Compare |
| 205/40R18 | 24.46" | 8.07" | −1.2% | 59.3 mph | Compare |
| 225/40R18 | 25.09" | 8.86" | +1.4% | 60.8 mph | Compare |
| 205/45R18 | 25.26" | 8.07" | +2.1% | 61.2 mph | Compare |
| 225/35R18 | 24.20" | 8.86" | −2.2% | 58.7 mph | Compare |
| 265/35R18 | 25.30" | 10.43" | +2.2% | 61.3 mph | Compare |
| 195/40R18 | 24.14" | 7.68" | −2.5% | 58.5 mph | Compare |
| 235/40R18 | 25.40" | 9.25" | +2.6% | 61.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 195/70R14 | 14" | 24.75" | 0.0% | Compare |
| 165/75R15 | 15" | 24.74" | 0.0% | Compare |
| 225/55R15 | 15" | 24.74" | 0.0% | Compare |
| 275/45R15 | 15" | 24.74" | 0.0% | Compare |
| 185/60R16 | 16" | 24.74" | 0.0% | Compare |
| 245/40R17 | 17" | 24.72" | −0.1% | Compare |
| 245/30R19 | 19" | 24.79" | +0.1% | Compare |
| 175/85R13 | 13" | 24.71" | −0.2% | Compare |
| 295/25R19 | 19" | 24.81" | +0.2% | Compare |
| 205/60R15 | 15" | 24.69" | −0.3% | Compare |
| 245/45R16 | 16" | 24.68" | −0.3% | Compare |
| 245/25R20 | 20" | 24.82" | +0.3% | Compare |
One size up or down
Compare 245/35R18 with another size
Questions
- How tall is a 245/35R18 tire?
- A 245/35R18 tire is 24.8 inches tall (629 mm), calculated from the size. It is 9.6 inches wide with 3.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/35R18 mean?
- 245/35R18 means a tire 245 mm wide, with sidewalls 35% as tall as the tire is wide (86 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 245/35R18 tire make?
- About 815 revolutions per mile, based on a circumference of 77.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/35R18 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 215/40R18 instead of 245/35R18?
- 215/40R18 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.