Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-18 | 245/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.25 (692.2) | 28.61 (726.7) | 1.36 (34.5) 5% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 85.61 (2174.61) | 89.88 (2283) | 4.27 (108.38) 5% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 5.31 (134.75) | 0.68 (17.25) 14.7% |
| Revolutions per mile (km) | 740.06 (459.85) | 704.93 (438.02) | -35.13 (-21.83) -4.7% |
245/55-18 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) | 36.74 mph (59.13 km/h) |
| 40 mph (64.37 km/h) | 41.99 mph (67.58 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 (101.37 km/h) |
| 65 mph (104.61 km/h) | 68.24 mph (109.82 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 (135.16 km/h) |
| 85 mph (136.79 km/h) | 89.24 mph (143.61 km/h) |
| 90 mph (144.84 km/h) | 94.49 mph (152.06 km/h) |
| 95 mph (152.89 km/h) | 99.73 mph (160.51 km/h) |
| 100 mph (160.93 km/h) | 104.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1794 | 2084 | 2244 | 2344 | 2450 | 2527 | 2611 | 2710 | 2847 | 2985 | 3137 | 3260 | 3481 | 3725 | 3916 | 4038 | 4107 | 4359 | 4710 | 5473 |
Better Fuel Economy Factory Ratios Increased Power
