Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/80-14 | 190/85-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.34 (643.6) | 27.72 (704) | 2.38 (60.4) 9.4% |
| Width inches (mm) | 7.09 (180) | 7.48 (190) | 0.39 (10) 5.6% |
| Circum. inches (mm) | 79.6 (2021.93) | 87.07 (2211.68) | 7.47 (189.75) 9.4% |
| Sidewall Height inches (mm) | 5.67 (144) | 6.36 (161.5) | 0.69 (17.5) 12.2% |
| Revolutions per mile (km) | 795.94 (494.58) | 727.66 (452.14) | -68.29 (-42.43) -8.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.88 mph (35.21 km/h) |
| 25 mph (40.23 km/h) | 27.35 mph (44.01 km/h) |
| 30 mph (48.28 km/h) | 32.82 mph (52.81 km/h) |
| 35 mph (56.33 km/h) | 38.28 mph (61.61 km/h) |
| 40 mph (64.37 km/h) | 43.75 mph (70.42 km/h) |
| 45 mph (72.42 km/h) | 49.22 mph (79.22 km/h) |
| 50 mph (80.47 km/h) | 54.69 mph (88.02 km/h) |
| 55 mph (88.51 km/h) | 60.16 mph (96.82 km/h) |
| 60 mph (96.56 km/h) | 65.63 mph (105.62 km/h) |
| 65 mph (104.61 km/h) | 71.1 mph (114.42 km/h) |
| 70 mph (112.65 km/h) | 76.57 mph (123.23 km/h) |
| 75 mph (120.7 km/h) | 82.04 mph (132.03 km/h) |
| 80 mph (128.75 km/h) | 87.51 mph (140.83 km/h) |
| 85 mph (136.79 km/h) | 92.98 mph (149.63 km/h) |
| 90 mph (144.84 km/h) | 98.45 mph (158.43 km/h) |
| 95 mph (152.89 km/h) | 103.92 mph (167.24 km/h) |
| 100 mph (160.93 km/h) | 109.38 mph (176.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1852 | 2151 | 2317 | 2419 | 2529 | 2608 | 2695 | 2797 | 2939 | 3081 | 3239 | 3365 | 3593 | 3845 | 4042 | 4168 | 4239 | 4499 | 4862 | 5650 |
Better Fuel Economy Factory Ratios Increased Power
