Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 235/70-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 30.45 (773.5) | 4.42 (112.3) 17% |
| Width inches (mm) | 4.72 (120) | 9.25 (235) | 4.53 (115) 95.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 95.67 (2430.02) | 13.89 (352.8) 17% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.48 (164.5) | 2.46 (62.5) 61.3% |
| Revolutions per mile (km) | 774.76 (481.41) | 662.28 (411.52) | -112.48 (-69.89) -14.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.4 mph (37.65 km/h) |
| 25 mph (40.23 km/h) | 29.25 mph (47.07 km/h) |
| 30 mph (48.28 km/h) | 35.1 mph (56.48 km/h) |
| 35 mph (56.33 km/h) | 40.94 mph (65.89 km/h) |
| 40 mph (64.37 km/h) | 46.79 mph (75.31 km/h) |
| 45 mph (72.42 km/h) | 52.64 mph (84.72 km/h) |
| 50 mph (80.47 km/h) | 58.49 mph (94.13 km/h) |
| 55 mph (88.51 km/h) | 64.34 mph (103.55 km/h) |
| 60 mph (96.56 km/h) | 70.19 mph (112.96 km/h) |
| 65 mph (104.61 km/h) | 76.04 mph (122.37 km/h) |
| 70 mph (112.65 km/h) | 81.89 mph (131.79 km/h) |
| 75 mph (120.7 km/h) | 87.74 mph (141.2 km/h) |
| 80 mph (128.75 km/h) | 93.59 mph (150.61 km/h) |
| 85 mph (136.79 km/h) | 99.44 mph (160.03 km/h) |
| 90 mph (144.84 km/h) | 105.29 mph (169.44 km/h) |
| 95 mph (152.89 km/h) | 111.14 mph (178.85 km/h) |
| 100 mph (160.93 km/h) | 116.98 mph (188.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1685 | 1958 | 2108 | 2202 | 2302 | 2374 | 2453 | 2546 | 2675 | 2804 | 2948 | 3062 | 3270 | 3500 | 3679 | 3794 | 3858 | 4095 | 4425 | 5142 |
Better Fuel Economy Factory Ratios Increased Power
