Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-18 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.98 (685.2) | 26.68 (677.7) | -0.3 (-7.5) -1.1% |
| Width inches (mm) | 11.22 (285) | 9.65 (245) | -1.57 (-40) -14% |
| Circum. inches (mm) | 84.75 (2152.62) | 83.82 (2129.06) | -0.93 (-23.56) -1.1% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.34 (110.25) | -0.15 (-3.75) -3.3% |
| Revolutions per mile (km) | 747.62 (464.55) | 755.9 (469.69) | 8.27 (5.14) 1.1% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.78 mph (31.83 km/h) |
| 25 mph (40.23 km/h) | 24.73 mph (39.79 km/h) |
| 30 mph (48.28 km/h) | 29.67 mph (47.75 km/h) |
| 35 mph (56.33 km/h) | 34.62 mph (55.71 km/h) |
| 40 mph (64.37 km/h) | 39.56 mph (63.67 km/h) |
| 45 mph (72.42 km/h) | 44.51 mph (71.63 km/h) |
| 50 mph (80.47 km/h) | 49.45 mph (79.59 km/h) |
| 55 mph (88.51 km/h) | 54.4 mph (87.55 km/h) |
| 60 mph (96.56 km/h) | 59.34 mph (95.5 km/h) |
| 65 mph (104.61 km/h) | 64.29 mph (103.46 km/h) |
| 70 mph (112.65 km/h) | 69.23 mph (111.42 km/h) |
| 75 mph (120.7 km/h) | 74.18 mph (119.38 km/h) |
| 80 mph (128.75 km/h) | 79.12 mph (127.34 km/h) |
| 85 mph (136.79 km/h) | 84.07 mph (135.3 km/h) |
| 90 mph (144.84 km/h) | 89.01 mph (143.26 km/h) |
| 95 mph (152.89 km/h) | 93.96 mph (151.21 km/h) |
| 100 mph (160.93 km/h) | 98.91 mph (159.17 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
