Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/80-15 | 185/75-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.39 (645) | 25.93 (658.5) | 0.53 (13.5) 2.1% |
| Width inches (mm) | 6.5 (165) | 7.28 (185) | 0.79 (20) 12.1% |
| Circum. inches (mm) | 79.78 (2026.33) | 81.45 (2068.74) | 1.67 (42.41) 2.1% |
| Sidewall Height inches (mm) | 5.2 (132) | 5.46 (138.75) | 0.27 (6.75) 5.1% |
| Revolutions per mile (km) | 794.22 (493.5) | 777.93 (483.39) | -16.28 (-10.12) -2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.42 mph (32.86 km/h) |
| 25 mph (40.23 km/h) | 25.52 mph (41.08 km/h) |
| 30 mph (48.28 km/h) | 30.63 mph (49.29 km/h) |
| 35 mph (56.33 km/h) | 35.73 mph (57.51 km/h) |
| 40 mph (64.37 km/h) | 40.84 mph (65.72 km/h) |
| 45 mph (72.42 km/h) | 45.94 mph (73.94 km/h) |
| 50 mph (80.47 km/h) | 51.05 mph (82.15 km/h) |
| 55 mph (88.51 km/h) | 56.15 mph (90.37 km/h) |
| 60 mph (96.56 km/h) | 61.26 mph (98.58 km/h) |
| 65 mph (104.61 km/h) | 66.36 mph (106.8 km/h) |
| 70 mph (112.65 km/h) | 71.47 mph (115.01 km/h) |
| 75 mph (120.7 km/h) | 76.57 mph (123.23 km/h) |
| 80 mph (128.75 km/h) | 81.67 mph (131.44 km/h) |
| 85 mph (136.79 km/h) | 86.78 mph (139.66 km/h) |
| 90 mph (144.84 km/h) | 91.88 mph (147.87 km/h) |
| 95 mph (152.89 km/h) | 96.99 mph (156.09 km/h) |
| 100 mph (160.93 km/h) | 102.09 mph (164.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1980 | 2300 | 2477 | 2586 | 2704 | 2788 | 2881 | 2991 | 3142 | 3294 | 3462 | 3597 | 3841 | 4111 | 4322 | 4456 | 4532 | 4810 | 5198 | 6040 |
Better Fuel Economy Factory Ratios Increased Power
