Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 185/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 25.28 (642.2) | -2.19 (-55.5) -8% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 86.29 (2191.89) | 79.43 (2017.53) | -6.86 (-174.36) -8% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 3.64 (92.5) | -1.09 (-27.75) -23.1% |
| Revolutions per mile (km) | 734.23 (456.23) | 797.68 (495.65) | 63.45 (39.43) 8.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.41 mph (29.63 km/h) |
| 25 mph (40.23 km/h) | 23.01 mph (37.03 km/h) |
| 30 mph (48.28 km/h) | 27.61 mph (44.44 km/h) |
| 35 mph (56.33 km/h) | 32.22 mph (51.85 km/h) |
| 40 mph (64.37 km/h) | 36.82 mph (59.25 km/h) |
| 45 mph (72.42 km/h) | 41.42 mph (66.66 km/h) |
| 50 mph (80.47 km/h) | 46.02 mph (74.07 km/h) |
| 55 mph (88.51 km/h) | 50.62 mph (81.47 km/h) |
| 60 mph (96.56 km/h) | 55.23 mph (88.88 km/h) |
| 65 mph (104.61 km/h) | 59.83 mph (96.29 km/h) |
| 70 mph (112.65 km/h) | 64.43 mph (103.69 km/h) |
| 75 mph (120.7 km/h) | 69.03 mph (111.1 km/h) |
| 80 mph (128.75 km/h) | 73.64 mph (118.51 km/h) |
| 85 mph (136.79 km/h) | 78.24 mph (125.91 km/h) |
| 90 mph (144.84 km/h) | 82.84 mph (133.32 km/h) |
| 95 mph (152.89 km/h) | 87.44 mph (140.73 km/h) |
| 100 mph (160.93 km/h) | 92.05 mph (148.13 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
