Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 32.1/9.5-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 32.11 (815.64) | 6.08 (154.44) 23.4% |
| Width inches (mm) | 4.72 (120) | 9.49 (241) | 4.76 (121) 100.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 100.88 (2562.41) | 19.1 (485.19) 23.4% |
| Sidewall Height inches (mm) | 4.02 (102) | 7.31 (185.57) | 3.29 (83.57) 81.9% |
| Revolutions per mile (km) | 774.76 (481.41) | 628.06 (390.26) | -146.7 (-91.15) -18.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.67 mph (39.71 km/h) |
| 25 mph (40.23 km/h) | 30.84 mph (49.63 km/h) |
| 30 mph (48.28 km/h) | 37.01 mph (59.56 km/h) |
| 35 mph (56.33 km/h) | 43.18 mph (69.48 km/h) |
| 40 mph (64.37 km/h) | 49.34 mph (79.41 km/h) |
| 45 mph (72.42 km/h) | 55.51 mph (89.34 km/h) |
| 50 mph (80.47 km/h) | 61.68 mph (99.26 km/h) |
| 55 mph (88.51 km/h) | 67.85 mph (109.19 km/h) |
| 60 mph (96.56 km/h) | 74.01 mph (119.12 km/h) |
| 65 mph (104.61 km/h) | 80.18 mph (129.04 km/h) |
| 70 mph (112.65 km/h) | 86.35 mph (138.97 km/h) |
| 75 mph (120.7 km/h) | 92.52 mph (148.89 km/h) |
| 80 mph (128.75 km/h) | 98.69 mph (158.82 km/h) |
| 85 mph (136.79 km/h) | 104.85 mph (168.75 km/h) |
| 90 mph (144.84 km/h) | 111.02 mph (178.67 km/h) |
| 95 mph (152.89 km/h) | 117.19 mph (188.6 km/h) |
| 100 mph (160.93 km/h) | 123.36 mph (198.53 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1598 | 1857 | 2000 | 2088 | 2183 | 2251 | 2326 | 2414 | 2537 | 2659 | 2795 | 2904 | 3101 | 3319 | 3489 | 3598 | 3659 | 3884 | 4196 | 4876 |
Better Fuel Economy Factory Ratios Increased Power
