Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-20 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.41 (645.5) | 26.68 (677.7) | 1.27 (32.2) 5% |
| Width inches (mm) | 10.83 (275) | 9.65 (245) | -1.18 (-30) -10.9% |
| Circum. inches (mm) | 79.84 (2027.9) | 83.82 (2129.06) | 3.98 (101.16) 5% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 4.34 (110.25) | 1.63 (41.5) 60.4% |
| Revolutions per mile (km) | 793.6 (493.12) | 755.9 (469.69) | -37.71 (-23.43) -4.8% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21 mph (33.79 km/h) |
| 25 mph (40.23 km/h) | 26.25 mph (42.24 km/h) |
| 30 mph (48.28 km/h) | 31.5 mph (50.69 km/h) |
| 35 mph (56.33 km/h) | 36.75 mph (59.14 km/h) |
| 40 mph (64.37 km/h) | 42 mph (67.59 km/h) |
| 45 mph (72.42 km/h) | 47.24 mph (76.03 km/h) |
| 50 mph (80.47 km/h) | 52.49 mph (84.48 km/h) |
| 55 mph (88.51 km/h) | 57.74 mph (92.93 km/h) |
| 60 mph (96.56 km/h) | 62.99 mph (101.38 km/h) |
| 65 mph (104.61 km/h) | 68.24 mph (109.83 km/h) |
| 70 mph (112.65 km/h) | 73.49 mph (118.27 km/h) |
| 75 mph (120.7 km/h) | 78.74 mph (126.72 km/h) |
| 80 mph (128.75 km/h) | 83.99 mph (135.17 km/h) |
| 85 mph (136.79 km/h) | 89.24 mph (143.62 km/h) |
| 90 mph (144.84 km/h) | 94.49 mph (152.07 km/h) |
| 95 mph (152.89 km/h) | 99.74 mph (160.51 km/h) |
| 100 mph (160.93 km/h) | 104.99 mph (168.96 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
