Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/70-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.44 (646.2) | 25.72 (653.2) | 0.28 (7) 1.1% |
| Width inches (mm) | 5.31 (135) | 9.65 (245) | 4.33 (110) 81.5% |
| Circum. inches (mm) | 79.93 (2030.1) | 80.79 (2052.09) | 0.87 (21.99) 1.1% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 3.86 (98) | 0.14 (3.5) 3.7% |
| Revolutions per mile (km) | 792.74 (492.59) | 784.25 (487.31) | -8.5 (-5.28) -1.1% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.22 mph (32.54 km/h) |
| 25 mph (40.23 km/h) | 25.27 mph (40.67 km/h) |
| 30 mph (48.28 km/h) | 30.32 mph (48.8 km/h) |
| 35 mph (56.33 km/h) | 35.38 mph (56.94 km/h) |
| 40 mph (64.37 km/h) | 40.43 mph (65.07 km/h) |
| 45 mph (72.42 km/h) | 45.49 mph (73.21 km/h) |
| 50 mph (80.47 km/h) | 50.54 mph (81.34 km/h) |
| 55 mph (88.51 km/h) | 55.6 mph (89.47 km/h) |
| 60 mph (96.56 km/h) | 60.65 mph (97.61 km/h) |
| 65 mph (104.61 km/h) | 65.7 mph (105.74 km/h) |
| 70 mph (112.65 km/h) | 70.76 mph (113.87 km/h) |
| 75 mph (120.7 km/h) | 75.81 mph (122.01 km/h) |
| 80 mph (128.75 km/h) | 80.87 mph (130.14 km/h) |
| 85 mph (136.79 km/h) | 85.92 mph (138.28 km/h) |
| 90 mph (144.84 km/h) | 90.97 mph (146.41 km/h) |
| 95 mph (152.89 km/h) | 96.03 mph (154.54 km/h) |
| 100 mph (160.93 km/h) | 101.08 mph (162.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 2318 | 2497 | 2607 | 2726 | 2811 | 2904 | 3015 | 3168 | 3321 | 3490 | 3626 | 3873 | 4144 | 4357 | 4493 | 4569 | 4849 | 5240 | 6089 |
Better Fuel Economy Factory Ratios Increased Power
