Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/55-16 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.04 (686.9) | 26.68 (677.7) | -0.36 (-9.2) -1.3% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 84.96 (2157.96) | 83.82 (2129.06) | -1.14 (-28.9) -1.3% |
| Sidewall Height inches (mm) | 5.52 (140.25) | 4.34 (110.25) | -1.18 (-30) -21.4% |
| Revolutions per mile (km) | 745.77 (463.4) | 755.9 (469.69) | 10.12 (6.29) 1.4% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.73 mph (31.76 km/h) |
| 25 mph (40.23 km/h) | 24.67 mph (39.69 km/h) |
| 30 mph (48.28 km/h) | 29.6 mph (47.63 km/h) |
| 35 mph (56.33 km/h) | 34.53 mph (55.57 km/h) |
| 40 mph (64.37 km/h) | 39.46 mph (63.51 km/h) |
| 45 mph (72.42 km/h) | 44.4 mph (71.45 km/h) |
| 50 mph (80.47 km/h) | 49.33 mph (79.39 km/h) |
| 55 mph (88.51 km/h) | 54.26 mph (87.33 km/h) |
| 60 mph (96.56 km/h) | 59.2 mph (95.27 km/h) |
| 65 mph (104.61 km/h) | 64.13 mph (103.21 km/h) |
| 70 mph (112.65 km/h) | 69.06 mph (111.15 km/h) |
| 75 mph (120.7 km/h) | 74 mph (119.08 km/h) |
| 80 mph (128.75 km/h) | 78.93 mph (127.02 km/h) |
| 85 mph (136.79 km/h) | 83.86 mph (134.96 km/h) |
| 90 mph (144.84 km/h) | 88.79 mph (142.9 km/h) |
| 95 mph (152.89 km/h) | 93.73 mph (150.84 km/h) |
| 100 mph (160.93 km/h) | 98.66 mph (158.78 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
