Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-18 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.18 (715.7) | 26.68 (677.7) | -1.5 (-38) -5.3% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 88.52 (2248.44) | 83.82 (2129.06) | -4.7 (-119.38) -5.3% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 4.34 (110.25) | -0.75 (-19) -14.7% |
| Revolutions per mile (km) | 715.76 (444.75) | 755.9 (469.69) | 40.13 (24.94) 5.6% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.94 mph (30.48 km/h) |
| 25 mph (40.23 km/h) | 23.67 mph (38.1 km/h) |
| 30 mph (48.28 km/h) | 28.41 mph (45.72 km/h) |
| 35 mph (56.33 km/h) | 33.14 mph (53.34 km/h) |
| 40 mph (64.37 km/h) | 37.88 mph (60.96 km/h) |
| 45 mph (72.42 km/h) | 42.61 mph (68.58 km/h) |
| 50 mph (80.47 km/h) | 47.35 mph (76.19 km/h) |
| 55 mph (88.51 km/h) | 52.08 mph (83.81 km/h) |
| 60 mph (96.56 km/h) | 56.81 mph (91.43 km/h) |
| 65 mph (104.61 km/h) | 61.55 mph (99.05 km/h) |
| 70 mph (112.65 km/h) | 66.28 mph (106.67 km/h) |
| 75 mph (120.7 km/h) | 71.02 mph (114.29 km/h) |
| 80 mph (128.75 km/h) | 75.75 mph (121.91 km/h) |
| 85 mph (136.79 km/h) | 80.49 mph (129.53 km/h) |
| 90 mph (144.84 km/h) | 85.22 mph (137.15 km/h) |
| 95 mph (152.89 km/h) | 89.96 mph (144.77 km/h) |
| 100 mph (160.93 km/h) | 94.69 mph (152.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1924 | 2235 | 2407 | 2513 | 2628 | 2709 | 2799 | 2906 | 3053 | 3201 | 3364 | 3495 | 3733 | 3995 | 4199 | 4330 | 4404 | 4674 | 5050 | 5869 |
Better Fuel Economy Factory Ratios Increased Power
