Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 305/75-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 35.01 (889.3) | 4.61 (117.1) 15.2% |
| Width inches (mm) | 6.89 (175) | 12.01 (305) | 5.12 (130) 74.3% |
| Circum. inches (mm) | 95.51 (2425.94) | 109.99 (2793.82) | 14.48 (367.88) 15.2% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 9.01 (228.75) | 2.81 (71.25) 45.2% |
| Revolutions per mile (km) | 663.39 (412.21) | 576.04 (357.93) | -87.35 (-54.28) -13.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.03 mph (37.07 km/h) |
| 25 mph (40.23 km/h) | 28.79 mph (46.33 km/h) |
| 30 mph (48.28 km/h) | 34.55 mph (55.6 km/h) |
| 35 mph (56.33 km/h) | 40.31 mph (64.87 km/h) |
| 40 mph (64.37 km/h) | 46.07 mph (74.14 km/h) |
| 45 mph (72.42 km/h) | 51.82 mph (83.4 km/h) |
| 50 mph (80.47 km/h) | 57.58 mph (92.67 km/h) |
| 55 mph (88.51 km/h) | 63.34 mph (101.94 km/h) |
| 60 mph (96.56 km/h) | 69.1 mph (111.2 km/h) |
| 65 mph (104.61 km/h) | 74.86 mph (120.47 km/h) |
| 70 mph (112.65 km/h) | 80.62 mph (129.74 km/h) |
| 75 mph (120.7 km/h) | 86.37 mph (139 km/h) |
| 80 mph (128.75 km/h) | 92.13 mph (148.27 km/h) |
| 85 mph (136.79 km/h) | 97.89 mph (157.54 km/h) |
| 90 mph (144.84 km/h) | 103.65 mph (166.81 km/h) |
| 95 mph (152.89 km/h) | 109.41 mph (176.07 km/h) |
| 100 mph (160.93 km/h) | 115.16 mph (185.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1466 | 1703 | 1834 | 1915 | 2002 | 2065 | 2133 | 2214 | 2327 | 2439 | 2564 | 2664 | 2844 | 3044 | 3200 | 3300 | 3356 | 3562 | 3849 | 4473 |
Better Fuel Economy Factory Ratios Increased Power
