225/35R18 tire size in inches
A 225/35R18 tire measures
24.2" tall × 8.9" wide
3.10" sidewall on a 18" wheel. 833 revolutions per mile.
225/35R18 means a tire 225 mm wide, with sidewalls 35% as tall as the tire is wide (79 mm), radial construction (R), for a 18 inch wheel.
225/35R18 specs
| Overall diameter (height) | 24.20 inches (615 mm) |
|---|---|
| Section width | 8.86 inches (225 mm) |
| Sidewall height | 3.10 inches (79 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 76.0 inches (1,931 mm) |
| Revolutions per mile | 833 |
| Revolutions per kilometer | 518 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 24.2x8.9R18 |
| 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 225/35R18 on a 18" wheel
These 18" sizes are within 3% of 225/35R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 195/40R18 | 24.14" | 7.68" | −0.2% | 59.9 mph | Compare |
| 205/40R18 | 24.46" | 8.07" | +1.1% | 60.6 mph | Compare |
| 235/35R18 | 24.48" | 9.25" | +1.1% | 60.7 mph | Compare |
| 215/35R18 | 23.93" | 8.46" | −1.1% | 59.3 mph | Compare |
| 205/35R18 | 23.65" | 8.07" | −2.3% | 58.6 mph | Compare |
| 245/35R18 | 24.75" | 9.65" | +2.3% | 61.4 mph | Compare |
| 215/40R18 | 24.77" | 8.46" | +2.4% | 61.4 mph | Compare |
| 195/45R18 | 24.91" | 7.68" | +2.9% | 61.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 185/70R14 | 14" | 24.20" | 0.0% | Compare |
| 195/60R15 | 15" | 24.21" | 0.0% | Compare |
| 265/25R19 | 19" | 24.22" | +0.1% | Compare |
| 235/55R14 | 14" | 24.18" | −0.1% | Compare |
| 215/25R20 | 20" | 24.23" | +0.1% | Compare |
| 215/60R14 | 14" | 24.16" | −0.2% | Compare |
| 235/50R15 | 15" | 24.25" | +0.2% | Compare |
| 205/45R17 | 17" | 24.26" | +0.3% | Compare |
| 175/60R16 | 16" | 24.27" | +0.3% | Compare |
| 185/50R17 | 17" | 24.28" | +0.3% | Compare |
| 205/70R13 | 13" | 24.30" | +0.4% | Compare |
| 235/60R13 | 13" | 24.10" | −0.4% | Compare |
One size up or down
Compare 225/35R18 with another size
Questions
- How tall is a 225/35R18 tire?
- A 225/35R18 tire is 24.2 inches tall (615 mm), calculated from the size. It is 8.9 inches wide with 3.1 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 225/35R18 mean?
- 225/35R18 means a tire 225 mm wide, with sidewalls 35% as tall as the tire is wide (79 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 225/35R18 tire make?
- About 833 revolutions per mile, based on a circumference of 76.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 225/35R18 tire?
- Roughly 7.5" to 9.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 195/40R18 instead of 225/35R18?
- 195/40R18 is −0.06 inches (−0.2%) 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.