Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 205/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 30.11 (764.7) | -0.3 (-7.5) -1% |
| Width inches (mm) | 6.89 (175) | 8.07 (205) | 1.18 (30) 17.1% |
| Circum. inches (mm) | 95.51 (2425.94) | 94.58 (2402.38) | -0.93 (-23.56) -1% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 6.05 (153.75) | -0.15 (-3.75) -2.4% |
| Revolutions per mile (km) | 663.39 (412.21) | 669.9 (416.25) | 6.51 (4.04) 1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.81 mph (31.87 km/h) |
| 25 mph (40.23 km/h) | 24.76 mph (39.84 km/h) |
| 30 mph (48.28 km/h) | 29.71 mph (47.81 km/h) |
| 35 mph (56.33 km/h) | 34.66 mph (55.78 km/h) |
| 40 mph (64.37 km/h) | 39.61 mph (63.75 km/h) |
| 45 mph (72.42 km/h) | 44.56 mph (71.72 km/h) |
| 50 mph (80.47 km/h) | 49.51 mph (79.69 km/h) |
| 55 mph (88.51 km/h) | 54.47 mph (87.65 km/h) |
| 60 mph (96.56 km/h) | 59.42 mph (95.62 km/h) |
| 65 mph (104.61 km/h) | 64.37 mph (103.59 km/h) |
| 70 mph (112.65 km/h) | 69.32 mph (111.56 km/h) |
| 75 mph (120.7 km/h) | 74.27 mph (119.53 km/h) |
| 80 mph (128.75 km/h) | 79.22 mph (127.5 km/h) |
| 85 mph (136.79 km/h) | 84.17 mph (135.47 km/h) |
| 90 mph (144.84 km/h) | 89.13 mph (143.43 km/h) |
| 95 mph (152.89 km/h) | 94.08 mph (151.4 km/h) |
| 100 mph (160.93 km/h) | 99.03 mph (159.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1705 | 1980 | 2133 | 2227 | 2329 | 2401 | 2481 | 2575 | 2706 | 2836 | 2982 | 3098 | 3308 | 3540 | 3721 | 3838 | 3903 | 4142 | 4476 | 5201 |
Better Fuel Economy Factory Ratios Increased Power
