Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-20 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.79 (655) | 26.68 (677.7) | 0.89 (22.7) 3.5% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 81.01 (2057.74) | 83.82 (2129.06) | 2.81 (71.31) 3.5% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 4.34 (110.25) | 1.45 (36.75) 50% |
| Revolutions per mile (km) | 782.09 (485.97) | 755.9 (469.69) | -26.2 (-16.28) -3.3% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.69 mph (33.3 km/h) |
| 25 mph (40.23 km/h) | 25.87 mph (41.63 km/h) |
| 30 mph (48.28 km/h) | 31.04 mph (49.95 km/h) |
| 35 mph (56.33 km/h) | 36.21 mph (58.28 km/h) |
| 40 mph (64.37 km/h) | 41.39 mph (66.6 km/h) |
| 45 mph (72.42 km/h) | 46.56 mph (74.93 km/h) |
| 50 mph (80.47 km/h) | 51.73 mph (83.26 km/h) |
| 55 mph (88.51 km/h) | 56.91 mph (91.58 km/h) |
| 60 mph (96.56 km/h) | 62.08 mph (99.91 km/h) |
| 65 mph (104.61 km/h) | 67.25 mph (108.23 km/h) |
| 70 mph (112.65 km/h) | 72.43 mph (116.56 km/h) |
| 75 mph (120.7 km/h) | 77.6 mph (124.88 km/h) |
| 80 mph (128.75 km/h) | 82.77 mph (133.21 km/h) |
| 85 mph (136.79 km/h) | 87.95 mph (141.54 km/h) |
| 90 mph (144.84 km/h) | 93.12 mph (149.86 km/h) |
| 95 mph (152.89 km/h) | 98.29 mph (158.19 km/h) |
| 100 mph (160.93 km/h) | 103.47 mph (166.51 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
