Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/65-18 | 185/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.21 (691.2) | 26.74 (679.2) | -0.47 (-12) -1.7% |
| Width inches (mm) | 7.09 (180) | 7.28 (185) | 0.2 (5) 2.8% |
| Circum. inches (mm) | 85.49 (2171.47) | 84.01 (2133.77) | -1.48 (-37.7) -1.7% |
| Sidewall Height inches (mm) | 4.61 (117) | 4.37 (111) | -0.24 (-6) -5.1% |
| Revolutions per mile (km) | 741.13 (460.52) | 754.23 (468.65) | 13.09 (8.14) 1.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.65 mph (31.63 km/h) |
| 25 mph (40.23 km/h) | 24.57 mph (39.54 km/h) |
| 30 mph (48.28 km/h) | 29.48 mph (47.44 km/h) |
| 35 mph (56.33 km/h) | 34.39 mph (55.35 km/h) |
| 40 mph (64.37 km/h) | 39.31 mph (63.26 km/h) |
| 45 mph (72.42 km/h) | 44.22 mph (71.16 km/h) |
| 50 mph (80.47 km/h) | 49.13 mph (79.07 km/h) |
| 55 mph (88.51 km/h) | 54.05 mph (86.98 km/h) |
| 60 mph (96.56 km/h) | 58.96 mph (94.88 km/h) |
| 65 mph (104.61 km/h) | 63.87 mph (102.79 km/h) |
| 70 mph (112.65 km/h) | 68.78 mph (110.7 km/h) |
| 75 mph (120.7 km/h) | 73.7 mph (118.61 km/h) |
| 80 mph (128.75 km/h) | 78.61 mph (126.51 km/h) |
| 85 mph (136.79 km/h) | 83.52 mph (134.42 km/h) |
| 90 mph (144.84 km/h) | 88.44 mph (142.33 km/h) |
| 95 mph (152.89 km/h) | 93.35 mph (150.23 km/h) |
| 100 mph (160.93 km/h) | 98.26 mph (158.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1919 | 2230 | 2401 | 2507 | 2622 | 2703 | 2793 | 2899 | 3046 | 3193 | 3357 | 3488 | 3724 | 3986 | 4190 | 4321 | 4394 | 4664 | 5039 | 5856 |
Better Fuel Economy Factory Ratios Increased Power
