Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-18 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.04 (712.2) | 26.68 (677.7) | -1.36 (-34.5) -4.8% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 88.09 (2237.44) | 83.82 (2129.06) | -4.27 (-108.38) -4.8% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 4.34 (110.25) | -0.68 (-17.25) -13.5% |
| Revolutions per mile (km) | 719.28 (446.94) | 755.9 (469.69) | 36.62 (22.75) 5.1% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.03 mph (30.63 km/h) |
| 25 mph (40.23 km/h) | 23.79 mph (38.28 km/h) |
| 30 mph (48.28 km/h) | 28.55 mph (45.94 km/h) |
| 35 mph (56.33 km/h) | 33.3 mph (53.6 km/h) |
| 40 mph (64.37 km/h) | 38.06 mph (61.26 km/h) |
| 45 mph (72.42 km/h) | 42.82 mph (68.91 km/h) |
| 50 mph (80.47 km/h) | 47.58 mph (76.57 km/h) |
| 55 mph (88.51 km/h) | 52.34 mph (84.23 km/h) |
| 60 mph (96.56 km/h) | 57.09 mph (91.88 km/h) |
| 65 mph (104.61 km/h) | 61.85 mph (99.54 km/h) |
| 70 mph (112.65 km/h) | 66.61 mph (107.2 km/h) |
| 75 mph (120.7 km/h) | 71.37 mph (114.85 km/h) |
| 80 mph (128.75 km/h) | 76.12 mph (122.51 km/h) |
| 85 mph (136.79 km/h) | 80.88 mph (130.17 km/h) |
| 90 mph (144.84 km/h) | 85.64 mph (137.82 km/h) |
| 95 mph (152.89 km/h) | 90.4 mph (145.48 km/h) |
| 100 mph (160.93 km/h) | 95.16 mph (153.14 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
