Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 205/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 29.3 (744.2) | -1.1 (-28) -3.6% |
| Width inches (mm) | 6.89 (175) | 8.07 (205) | 1.18 (30) 17.1% |
| Circum. inches (mm) | 95.51 (2425.94) | 92.05 (2337.97) | -3.46 (-87.96) -3.6% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.65 (143.5) | -0.55 (-14) -8.9% |
| Revolutions per mile (km) | 663.39 (412.21) | 688.35 (427.72) | 24.96 (15.51) 3.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.27 mph (31.02 km/h) |
| 25 mph (40.23 km/h) | 24.09 mph (38.77 km/h) |
| 30 mph (48.28 km/h) | 28.91 mph (46.53 km/h) |
| 35 mph (56.33 km/h) | 33.73 mph (54.28 km/h) |
| 40 mph (64.37 km/h) | 38.55 mph (62.04 km/h) |
| 45 mph (72.42 km/h) | 43.37 mph (69.79 km/h) |
| 50 mph (80.47 km/h) | 48.19 mph (77.55 km/h) |
| 55 mph (88.51 km/h) | 53.01 mph (85.3 km/h) |
| 60 mph (96.56 km/h) | 57.82 mph (93.06 km/h) |
| 65 mph (104.61 km/h) | 62.64 mph (100.81 km/h) |
| 70 mph (112.65 km/h) | 67.46 mph (108.57 km/h) |
| 75 mph (120.7 km/h) | 72.28 mph (116.32 km/h) |
| 80 mph (128.75 km/h) | 77.1 mph (124.08 km/h) |
| 85 mph (136.79 km/h) | 81.92 mph (131.83 km/h) |
| 90 mph (144.84 km/h) | 86.74 mph (139.59 km/h) |
| 95 mph (152.89 km/h) | 91.56 mph (147.34 km/h) |
| 100 mph (160.93 km/h) | 96.37 mph (155.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1752 | 2035 | 2192 | 2288 | 2393 | 2467 | 2549 | 2646 | 2780 | 2915 | 3064 | 3183 | 3399 | 3638 | 3824 | 3943 | 4010 | 4256 | 4599 | 5345 |
Better Fuel Economy Factory Ratios Increased Power
