195/70R18 tire size in inches
A 195/70R18 tire measures
28.7" tall × 7.7" wide
5.37" sidewall on a 18" wheel. 702 revolutions per mile.
195/70R18 means a tire 195 mm wide, with sidewalls 70% as tall as the tire is wide (137 mm), radial construction (R), for a 18 inch wheel.
195/70R18 specs
| Overall diameter (height) | 28.75 inches (730 mm) |
|---|---|
| Section width | 7.68 inches (195 mm) |
| Sidewall height | 5.37 inches (137 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 90.3 inches (2,294 mm) |
| Revolutions per mile | 702 |
| Revolutions per kilometer | 436 |
| Approximate rim width | 5.0" to 6.5" |
| In inches (flotation style) | 28.7x7.7R18 |
| 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 195/70R18 on a 18" wheel
These 18" sizes are within 3% of 195/70R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 305/45R18 | 28.81" | 12.01" | +0.2% | 60.1 mph | Compare |
| 275/50R18 | 28.83" | 10.83" | +0.3% | 60.2 mph | Compare |
| 225/60R18 | 28.63" | 8.86" | −0.4% | 59.8 mph | Compare |
| 245/55R18 | 28.61" | 9.65" | −0.5% | 59.7 mph | Compare |
| 335/40R18 | 28.55" | 13.19" | −0.7% | 59.6 mph | Compare |
| 205/65R18 | 28.49" | 8.07" | −0.9% | 59.5 mph | Compare |
| 215/65R18 | 29.00" | 8.46" | +0.9% | 60.5 mph | Compare |
| 255/55R18 | 29.04" | 10.04" | +1.0% | 60.6 mph | Compare |
| 295/45R18 | 28.45" | 11.61" | −1.0% | 59.4 mph | Compare |
| 265/50R18 | 28.43" | 10.43" | −1.1% | 59.3 mph | Compare |
| 235/60R18 | 29.10" | 9.25" | +1.2% | 60.7 mph | Compare |
| 315/45R18 | 29.16" | 12.40" | +1.4% | 60.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/55R19 | 19" | 28.74" | 0.0% | Compare |
| 245/35R22 | 22" | 28.75" | 0.0% | Compare |
| 275/45R19 | 19" | 28.74" | 0.0% | Compare |
| 285/30R22 | 22" | 28.73" | −0.1% | Compare |
| 235/85R13 | 13" | 28.73" | −0.1% | Compare |
| 205/85R15 | 15" | 28.72" | −0.1% | Compare |
| 295/55R16 | 16" | 28.78" | +0.1% | Compare |
| 245/40R21 | 21" | 28.72" | −0.1% | Compare |
| 355/35R19 | 19" | 28.78" | +0.1% | Compare |
| 345/25R22 | 22" | 28.79" | +0.2% | Compare |
| 215/75R16 | 16" | 28.70" | −0.2% | Compare |
| 235/80R14 | 14" | 28.80" | +0.2% | Compare |
One size up or down
- 205/70R18wider: 29.3" × 8.1"
- 195/65R18lower profile: 28.0" × 7.7"
- 195/75R18taller sidewall: 29.5" × 7.7"
Compare 195/70R18 with another size
Questions
- How tall is a 195/70R18 tire?
- A 195/70R18 tire is 28.7 inches tall (730 mm), calculated from the size. It is 7.7 inches wide with 5.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 195/70R18 mean?
- 195/70R18 means a tire 195 mm wide, with sidewalls 70% as tall as the tire is wide (137 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 195/70R18 tire make?
- About 702 revolutions per mile, based on a circumference of 90.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 195/70R18 tire?
- Roughly 5.0" to 6.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 305/45R18 instead of 195/70R18?
- 305/45R18 is +0.06 inches (+0.2%) 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.