Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/60-18 | 185/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.61 (625.2) | 25.28 (642.2) | 0.67 (17) 2.7% |
| Width inches (mm) | 5.51 (140) | 7.28 (185) | 1.77 (45) 32.1% |
| Circum. inches (mm) | 77.33 (1964.12) | 79.43 (2017.53) | 2.1 (53.41) 2.7% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.64 (92.5) | 0.33 (8.5) 10.1% |
| Revolutions per mile (km) | 819.37 (509.13) | 797.68 (495.65) | -21.69 (-13.48) -2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.54 mph (33.06 km/h) |
| 25 mph (40.23 km/h) | 25.68 mph (41.33 km/h) |
| 30 mph (48.28 km/h) | 30.82 mph (49.59 km/h) |
| 35 mph (56.33 km/h) | 35.95 mph (57.86 km/h) |
| 40 mph (64.37 km/h) | 41.09 mph (66.12 km/h) |
| 45 mph (72.42 km/h) | 46.22 mph (74.39 km/h) |
| 50 mph (80.47 km/h) | 51.36 mph (82.66 km/h) |
| 55 mph (88.51 km/h) | 56.5 mph (90.92 km/h) |
| 60 mph (96.56 km/h) | 61.63 mph (99.19 km/h) |
| 65 mph (104.61 km/h) | 66.77 mph (107.45 km/h) |
| 70 mph (112.65 km/h) | 71.9 mph (115.72 km/h) |
| 75 mph (120.7 km/h) | 77.04 mph (123.98 km/h) |
| 80 mph (128.75 km/h) | 82.18 mph (132.25 km/h) |
| 85 mph (136.79 km/h) | 87.31 mph (140.51 km/h) |
| 90 mph (144.84 km/h) | 92.45 mph (148.78 km/h) |
| 95 mph (152.89 km/h) | 97.58 mph (157.05 km/h) |
| 100 mph (160.93 km/h) | 102.72 mph (165.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2030 | 2358 | 2540 | 2652 | 2773 | 2859 | 2954 | 3067 | 3222 | 3377 | 3550 | 3688 | 3939 | 4215 | 4431 | 4570 | 4647 | 4932 | 5330 | 6193 |
Better Fuel Economy Factory Ratios Increased Power
