Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/55-18 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.31 (693.7) | 26.68 (677.7) | -0.63 (-16) -2.3% |
| Width inches (mm) | 8.46 (215) | 9.65 (245) | 1.18 (30) 14% |
| Circum. inches (mm) | 85.8 (2179.32) | 83.82 (2129.06) | -1.98 (-50.27) -2.3% |
| Sidewall Height inches (mm) | 4.66 (118.25) | 4.34 (110.25) | -0.31 (-8) -6.8% |
| Revolutions per mile (km) | 738.46 (458.86) | 755.9 (469.69) | 17.43 (10.83) 2.4% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.54 mph (31.44 km/h) |
| 25 mph (40.23 km/h) | 24.42 mph (39.31 km/h) |
| 30 mph (48.28 km/h) | 29.31 mph (47.17 km/h) |
| 35 mph (56.33 km/h) | 34.19 mph (55.03 km/h) |
| 40 mph (64.37 km/h) | 39.08 mph (62.89 km/h) |
| 45 mph (72.42 km/h) | 43.96 mph (70.75 km/h) |
| 50 mph (80.47 km/h) | 48.85 mph (78.61 km/h) |
| 55 mph (88.51 km/h) | 53.73 mph (86.47 km/h) |
| 60 mph (96.56 km/h) | 58.62 mph (94.33 km/h) |
| 65 mph (104.61 km/h) | 63.5 mph (102.19 km/h) |
| 70 mph (112.65 km/h) | 68.39 mph (110.06 km/h) |
| 75 mph (120.7 km/h) | 73.27 mph (117.92 km/h) |
| 80 mph (128.75 km/h) | 78.15 mph (125.78 km/h) |
| 85 mph (136.79 km/h) | 83.04 mph (133.64 km/h) |
| 90 mph (144.84 km/h) | 87.92 mph (141.5 km/h) |
| 95 mph (152.89 km/h) | 92.81 mph (149.36 km/h) |
| 100 mph (160.93 km/h) | 97.69 mph (157.22 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
