Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/35-18 | 255/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.85 (656.7) | 26.03 (661.2) | 0.18 (4.5) 0.7% |
| Width inches (mm) | 11.22 (285) | 10.04 (255) | -1.18 (-30) -10.5% |
| Circum. inches (mm) | 81.22 (2063.08) | 81.78 (2077.22) | 0.56 (14.14) 0.7% |
| Sidewall Height inches (mm) | 3.93 (99.75) | 4.02 (102) | 0.09 (2.25) 2.3% |
| Revolutions per mile (km) | 780.07 (484.71) | 774.76 (481.41) | -5.31 (-3.3) -0.7% |
255/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.14 mph (32.41 km/h) |
| 25 mph (40.23 km/h) | 25.17 mph (40.51 km/h) |
| 30 mph (48.28 km/h) | 30.21 mph (48.61 km/h) |
| 35 mph (56.33 km/h) | 35.24 mph (56.71 km/h) |
| 40 mph (64.37 km/h) | 40.27 mph (64.82 km/h) |
| 45 mph (72.42 km/h) | 45.31 mph (72.92 km/h) |
| 50 mph (80.47 km/h) | 50.34 mph (81.02 km/h) |
| 55 mph (88.51 km/h) | 55.38 mph (89.12 km/h) |
| 60 mph (96.56 km/h) | 60.41 mph (97.22 km/h) |
| 65 mph (104.61 km/h) | 65.45 mph (105.32 km/h) |
| 70 mph (112.65 km/h) | 70.48 mph (113.43 km/h) |
| 75 mph (120.7 km/h) | 75.51 mph (121.53 km/h) |
| 80 mph (128.75 km/h) | 80.55 mph (129.63 km/h) |
| 85 mph (136.79 km/h) | 85.58 mph (137.73 km/h) |
| 90 mph (144.84 km/h) | 90.62 mph (145.83 km/h) |
| 95 mph (152.89 km/h) | 95.65 mph (153.94 km/h) |
| 100 mph (160.93 km/h) | 100.69 mph (162.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1972 | 2290 | 2467 | 2576 | 2693 | 2777 | 2869 | 2978 | 3129 | 3280 | 3448 | 3582 | 3826 | 4094 | 4304 | 4438 | 4514 | 4791 | 5177 | 6016 |
Better Fuel Economy Factory Ratios Increased Power
