Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 170/65-16 | 180/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.7 (627.4) | 27.21 (691.2) | 2.51 (63.8) 10.2% |
| Width inches (mm) | 6.69 (170) | 7.09 (180) | 0.39 (10) 5.9% |
| Circum. inches (mm) | 77.6 (1971.04) | 85.49 (2171.47) | 7.89 (200.43) 10.2% |
| Sidewall Height inches (mm) | 4.35 (110.5) | 4.61 (117) | 0.26 (6.5) 5.9% |
| Revolutions per mile (km) | 816.5 (507.35) | 741.13 (460.52) | -75.37 (-46.83) -9.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.03 mph (35.46 km/h) |
| 25 mph (40.23 km/h) | 27.54 mph (44.33 km/h) |
| 30 mph (48.28 km/h) | 33.05 mph (53.19 km/h) |
| 35 mph (56.33 km/h) | 38.56 mph (62.06 km/h) |
| 40 mph (64.37 km/h) | 44.07 mph (70.92 km/h) |
| 45 mph (72.42 km/h) | 49.58 mph (79.79 km/h) |
| 50 mph (80.47 km/h) | 55.08 mph (88.65 km/h) |
| 55 mph (88.51 km/h) | 60.59 mph (97.52 km/h) |
| 60 mph (96.56 km/h) | 66.1 mph (106.38 km/h) |
| 65 mph (104.61 km/h) | 71.61 mph (115.25 km/h) |
| 70 mph (112.65 km/h) | 77.12 mph (124.11 km/h) |
| 75 mph (120.7 km/h) | 82.63 mph (132.98 km/h) |
| 80 mph (128.75 km/h) | 88.14 mph (141.84 km/h) |
| 85 mph (136.79 km/h) | 93.64 mph (150.71 km/h) |
| 90 mph (144.84 km/h) | 99.15 mph (159.57 km/h) |
| 95 mph (152.89 km/h) | 104.66 mph (168.44 km/h) |
| 100 mph (160.93 km/h) | 110.17 mph (177.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1886 | 2191 | 2360 | 2464 | 2576 | 2657 | 2745 | 2849 | 2994 | 3138 | 3299 | 3427 | 3660 | 3917 | 4117 | 4246 | 4318 | 4583 | 4952 | 5754 |
Better Fuel Economy Factory Ratios Increased Power
