Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-17 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.5 (647.8) | 26.68 (677.7) | 1.18 (29.9) 4.6% |
| Width inches (mm) | 5.31 (135) | 9.65 (245) | 4.33 (110) 81.5% |
| Circum. inches (mm) | 80.12 (2035.12) | 83.82 (2129.06) | 3.7 (93.93) 4.6% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.34 (110.25) | 0.09 (2.25) 2.1% |
| Revolutions per mile (km) | 790.78 (491.37) | 755.9 (469.69) | -34.89 (-21.68) -4.4% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.92 mph (33.67 km/h) |
| 25 mph (40.23 km/h) | 26.15 mph (42.09 km/h) |
| 30 mph (48.28 km/h) | 31.38 mph (50.51 km/h) |
| 35 mph (56.33 km/h) | 36.62 mph (58.93 km/h) |
| 40 mph (64.37 km/h) | 41.85 mph (67.35 km/h) |
| 45 mph (72.42 km/h) | 47.08 mph (75.76 km/h) |
| 50 mph (80.47 km/h) | 52.31 mph (84.18 km/h) |
| 55 mph (88.51 km/h) | 57.54 mph (92.6 km/h) |
| 60 mph (96.56 km/h) | 62.77 mph (101.02 km/h) |
| 65 mph (104.61 km/h) | 68 mph (109.44 km/h) |
| 70 mph (112.65 km/h) | 73.23 mph (117.85 km/h) |
| 75 mph (120.7 km/h) | 78.46 mph (126.27 km/h) |
| 80 mph (128.75 km/h) | 83.69 mph (134.69 km/h) |
| 85 mph (136.79 km/h) | 88.92 mph (143.11 km/h) |
| 90 mph (144.84 km/h) | 94.15 mph (151.53 km/h) |
| 95 mph (152.89 km/h) | 99.38 mph (159.94 km/h) |
| 100 mph (160.93 km/h) | 104.62 mph (168.36 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
