Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/50-17 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.86 (656.8) | 26.68 (677.7) | 0.82 (20.9) 3.2% |
| Width inches (mm) | 8.86 (225) | 9.65 (245) | 0.79 (20) 8.9% |
| Circum. inches (mm) | 81.24 (2063.4) | 83.82 (2129.06) | 2.59 (65.66) 3.2% |
| Sidewall Height inches (mm) | 4.43 (112.5) | 4.34 (110.25) | -0.09 (-2.25) -2% |
| Revolutions per mile (km) | 779.95 (484.64) | 755.9 (469.69) | -24.05 (-14.95) -3.1% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.64 mph (33.21 km/h) |
| 25 mph (40.23 km/h) | 25.8 mph (41.51 km/h) |
| 30 mph (48.28 km/h) | 30.95 mph (49.82 km/h) |
| 35 mph (56.33 km/h) | 36.11 mph (58.12 km/h) |
| 40 mph (64.37 km/h) | 41.27 mph (66.42 km/h) |
| 45 mph (72.42 km/h) | 46.43 mph (74.73 km/h) |
| 50 mph (80.47 km/h) | 51.59 mph (83.03 km/h) |
| 55 mph (88.51 km/h) | 56.75 mph (91.33 km/h) |
| 60 mph (96.56 km/h) | 61.91 mph (99.63 km/h) |
| 65 mph (104.61 km/h) | 67.07 mph (107.94 km/h) |
| 70 mph (112.65 km/h) | 72.23 mph (116.24 km/h) |
| 75 mph (120.7 km/h) | 77.39 mph (124.54 km/h) |
| 80 mph (128.75 km/h) | 82.55 mph (132.84 km/h) |
| 85 mph (136.79 km/h) | 87.7 mph (141.15 km/h) |
| 90 mph (144.84 km/h) | 92.86 mph (149.45 km/h) |
| 95 mph (152.89 km/h) | 98.02 mph (157.75 km/h) |
| 100 mph (160.93 km/h) | 103.18 mph (166.06 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
