Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-18 | 185/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 25.28 (642.2) | -1.22 (-31) -4.6% |
| Width inches (mm) | 5.31 (135) | 7.28 (185) | 1.97 (50) 37% |
| Circum. inches (mm) | 83.26 (2114.92) | 79.43 (2017.53) | -3.83 (-97.39) -4.6% |
| Sidewall Height inches (mm) | 4.25 (108) | 3.64 (92.5) | -0.61 (-15.5) -14.4% |
| Revolutions per mile (km) | 760.95 (472.83) | 797.68 (495.65) | 36.73 (22.82) 4.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.08 mph (30.7 km/h) |
| 25 mph (40.23 km/h) | 23.85 mph (38.38 km/h) |
| 30 mph (48.28 km/h) | 28.62 mph (46.06 km/h) |
| 35 mph (56.33 km/h) | 33.39 mph (53.73 km/h) |
| 40 mph (64.37 km/h) | 38.16 mph (61.41 km/h) |
| 45 mph (72.42 km/h) | 42.93 mph (69.09 km/h) |
| 50 mph (80.47 km/h) | 47.7 mph (76.76 km/h) |
| 55 mph (88.51 km/h) | 52.47 mph (84.44 km/h) |
| 60 mph (96.56 km/h) | 57.24 mph (92.11 km/h) |
| 65 mph (104.61 km/h) | 62.01 mph (99.79 km/h) |
| 70 mph (112.65 km/h) | 66.78 mph (107.47 km/h) |
| 75 mph (120.7 km/h) | 71.55 mph (115.14 km/h) |
| 80 mph (128.75 km/h) | 76.32 mph (122.82 km/h) |
| 85 mph (136.79 km/h) | 81.09 mph (130.5 km/h) |
| 90 mph (144.84 km/h) | 85.86 mph (138.17 km/h) |
| 95 mph (152.89 km/h) | 90.63 mph (145.85 km/h) |
| 100 mph (160.93 km/h) | 95.4 mph (153.52 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
