Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-18 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.72 (653.2) | 26.68 (677.7) | 0.96 (24.5) 3.8% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 80.79 (2052.09) | 83.82 (2129.06) | 3.03 (76.97) 3.8% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.34 (110.25) | 0.48 (12.25) 12.5% |
| Revolutions per mile (km) | 784.25 (487.31) | 755.9 (469.69) | -28.35 (-17.62) -3.6% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.75 mph (33.39 km/h) |
| 25 mph (40.23 km/h) | 25.94 mph (41.74 km/h) |
| 30 mph (48.28 km/h) | 31.13 mph (50.09 km/h) |
| 35 mph (56.33 km/h) | 36.31 mph (58.44 km/h) |
| 40 mph (64.37 km/h) | 41.5 mph (66.79 km/h) |
| 45 mph (72.42 km/h) | 46.69 mph (75.14 km/h) |
| 50 mph (80.47 km/h) | 51.88 mph (83.49 km/h) |
| 55 mph (88.51 km/h) | 57.06 mph (91.83 km/h) |
| 60 mph (96.56 km/h) | 62.25 mph (100.18 km/h) |
| 65 mph (104.61 km/h) | 67.44 mph (108.53 km/h) |
| 70 mph (112.65 km/h) | 72.63 mph (116.88 km/h) |
| 75 mph (120.7 km/h) | 77.81 mph (125.23 km/h) |
| 80 mph (128.75 km/h) | 83 mph (133.58 km/h) |
| 85 mph (136.79 km/h) | 88.19 mph (141.93 km/h) |
| 90 mph (144.84 km/h) | 93.38 mph (150.27 km/h) |
| 95 mph (152.89 km/h) | 98.56 mph (158.62 km/h) |
| 100 mph (160.93 km/h) | 103.75 mph (166.97 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 |
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