Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/70-18 | 320/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.44 (646.2) | 35.64 (905.2) | 10.2 (259) 40.1% |
| Width inches (mm) | 5.31 (135) | 12.6 (320) | 7.28 (185) 137% |
| Circum. inches (mm) | 79.93 (2030.1) | 111.96 (2843.77) | 32.03 (813.67) 40.1% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 8.82 (224) | 5.1 (129.5) 137% |
| Revolutions per mile (km) | 792.74 (492.59) | 565.92 (351.65) | -226.82 (-140.94) -28.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 28.02 mph (45.09 km/h) |
| 25 mph (40.23 km/h) | 35.02 mph (56.36 km/h) |
| 30 mph (48.28 km/h) | 42.02 mph (67.63 km/h) |
| 35 mph (56.33 km/h) | 49.03 mph (78.9 km/h) |
| 40 mph (64.37 km/h) | 56.03 mph (90.18 km/h) |
| 45 mph (72.42 km/h) | 63.04 mph (101.45 km/h) |
| 50 mph (80.47 km/h) | 70.04 mph (112.72 km/h) |
| 55 mph (88.51 km/h) | 77.04 mph (123.99 km/h) |
| 60 mph (96.56 km/h) | 84.05 mph (135.26 km/h) |
| 65 mph (104.61 km/h) | 91.05 mph (146.53 km/h) |
| 70 mph (112.65 km/h) | 98.06 mph (157.81 km/h) |
| 75 mph (120.7 km/h) | 105.06 mph (169.08 km/h) |
| 80 mph (128.75 km/h) | 112.06 mph (180.35 km/h) |
| 85 mph (136.79 km/h) | 119.07 mph (191.62 km/h) |
| 90 mph (144.84 km/h) | 126.07 mph (202.89 km/h) |
| 95 mph (152.89 km/h) | 133.08 mph (214.17 km/h) |
| 100 mph (160.93 km/h) | 140.08 mph (225.44 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1440 | 1673 | 1802 | 1881 | 1967 | 2028 | 2096 | 2176 | 2286 | 2396 | 2519 | 2617 | 2795 | 2991 | 3144 | 3242 | 3297 | 3499 | 3781 | 4394 |
Better Fuel Economy Factory Ratios Increased Power
