Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/80-19 | 255/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.02 (762.6) | 32.06 (814.2) | 2.03 (51.6) 6.8% |
| Width inches (mm) | 6.89 (175) | 10.04 (255) | 3.15 (80) 45.7% |
| Circum. inches (mm) | 94.32 (2395.78) | 100.7 (2557.88) | 6.38 (162.11) 6.8% |
| Sidewall Height inches (mm) | 5.51 (140) | 7.03 (178.5) | 1.52 (38.5) 27.5% |
| Revolutions per mile (km) | 671.74 (417.4) | 629.17 (390.95) | -42.57 (-26.45) -6.3% |
255/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.35 mph (34.36 km/h) |
| 25 mph (40.23 km/h) | 26.69 mph (42.96 km/h) |
| 30 mph (48.28 km/h) | 32.03 mph (51.55 km/h) |
| 35 mph (56.33 km/h) | 37.37 mph (60.14 km/h) |
| 40 mph (64.37 km/h) | 42.71 mph (68.73 km/h) |
| 45 mph (72.42 km/h) | 48.04 mph (77.32 km/h) |
| 50 mph (80.47 km/h) | 53.38 mph (85.91 km/h) |
| 55 mph (88.51 km/h) | 58.72 mph (94.5 km/h) |
| 60 mph (96.56 km/h) | 64.06 mph (103.09 km/h) |
| 65 mph (104.61 km/h) | 69.4 mph (111.69 km/h) |
| 70 mph (112.65 km/h) | 74.74 mph (120.28 km/h) |
| 75 mph (120.7 km/h) | 80.07 mph (128.87 km/h) |
| 80 mph (128.75 km/h) | 85.41 mph (137.46 km/h) |
| 85 mph (136.79 km/h) | 90.75 mph (146.05 km/h) |
| 90 mph (144.84 km/h) | 96.09 mph (154.64 km/h) |
| 95 mph (152.89 km/h) | 101.43 mph (163.23 km/h) |
| 100 mph (160.93 km/h) | 106.77 mph (171.82 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1601 | 1860 | 2003 | 2092 | 2187 | 2255 | 2330 | 2419 | 2541 | 2664 | 2800 | 2909 | 3107 | 3325 | 3495 | 3604 | 3666 | 3890 | 4204 | 4885 |
Better Fuel Economy Factory Ratios Increased Power
