325/70R18 tire size in inches
A 325/70R18 tire measures
35.9" tall × 12.8" wide
8.96" sidewall on a 18" wheel. 562 revolutions per mile.
325/70R18 means a tire 325 mm wide, with sidewalls 70% as tall as the tire is wide (228 mm), radial construction (R), for a 18 inch wheel.
325/70R18 specs
| Overall diameter (height) | 35.91 inches (912 mm) |
|---|---|
| Section width | 12.80 inches (325 mm) |
| Sidewall height | 8.96 inches (228 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 112.8 inches (2,866 mm) |
| Revolutions per mile | 562 |
| Revolutions per kilometer | 349 |
| Approximate rim width | 8.5" to 10.0" |
| In inches (flotation style) | 35.9x12.8R18 |
| Aspect ratio | 70% |
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 325/70R18 on a 18" wheel
These 18" sizes are within 3% of 325/70R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 295/75R18 | 35.42" | 11.61" | −1.4% | 59.2 mph | Compare |
| 315/70R18 | 35.36" | 12.40" | −1.5% | 59.1 mph | Compare |
| 335/65R18 | 35.15" | 13.19" | −2.1% | 58.7 mph | Compare |
| 35x12.50R18 | 35.00" | 12.50" | −2.5% | 58.5 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 345/55R21 | 21" | 35.94" | +0.1% | Compare |
| 355/50R22 | 22" | 35.98" | +0.2% | Compare |
| 335/60R20 | 20" | 35.83" | −0.2% | Compare |
| 355/60R19 | 19" | 35.77" | −0.4% | Compare |
| 295/85R16 | 16" | 35.74" | −0.5% | Compare |
| 315/55R22 | 22" | 35.64" | −0.8% | Compare |
| 325/65R19 | 19" | 35.63" | −0.8% | Compare |
| 305/65R20 | 20" | 35.61" | −0.8% | Compare |
| 315/75R17 | 17" | 35.60" | −0.9% | Compare |
| 345/50R22 | 22" | 35.58" | −0.9% | Compare |
| 335/55R21 | 21" | 35.51" | −1.1% | Compare |
| 355/55R20 | 20" | 35.37" | −1.5% | Compare |
One size up or down
Compare 325/70R18 with another size
Questions
- How tall is a 325/70R18 tire?
- A 325/70R18 tire is 35.9 inches tall (912 mm), calculated from the size. It is 12.8 inches wide with 9.0 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 325/70R18 mean?
- 325/70R18 means a tire 325 mm wide, with sidewalls 70% as tall as the tire is wide (228 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 325/70R18 tire make?
- About 562 revolutions per mile, based on a circumference of 112.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 325/70R18 tire?
- Roughly 8.5" to 10.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 295/75R18 instead of 325/70R18?
- 295/75R18 is −0.49 inches (−1.4%) in overall diameter, so at an indicated 60 mph you would be doing 59.2 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.