Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/55-12 | 185/80-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 19.15 (486.3) | 23.65 (600.8) | 4.51 (114.5) 23.5% |
| Width inches (mm) | 6.5 (165) | 7.28 (185) | 0.79 (20) 12.1% |
| Circum. inches (mm) | 60.15 (1527.76) | 74.31 (1887.47) | 14.16 (359.71) 23.5% |
| Sidewall Height inches (mm) | 3.57 (90.75) | 5.83 (148) | 2.25 (57.25) 63.1% |
| Revolutions per mile (km) | 1053.4 (654.55) | 852.65 (529.81) | -200.76 (-124.74) -19.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.71 mph (39.77 km/h) |
| 25 mph (40.23 km/h) | 30.89 mph (49.71 km/h) |
| 30 mph (48.28 km/h) | 37.06 mph (59.65 km/h) |
| 35 mph (56.33 km/h) | 43.24 mph (69.59 km/h) |
| 40 mph (64.37 km/h) | 49.42 mph (79.53 km/h) |
| 45 mph (72.42 km/h) | 55.6 mph (89.47 km/h) |
| 50 mph (80.47 km/h) | 61.77 mph (99.41 km/h) |
| 55 mph (88.51 km/h) | 67.95 mph (109.35 km/h) |
| 60 mph (96.56 km/h) | 74.13 mph (119.3 km/h) |
| 65 mph (104.61 km/h) | 80.3 mph (129.24 km/h) |
| 70 mph (112.65 km/h) | 86.48 mph (139.18 km/h) |
| 75 mph (120.7 km/h) | 92.66 mph (149.12 km/h) |
| 80 mph (128.75 km/h) | 98.84 mph (159.06 km/h) |
| 85 mph (136.79 km/h) | 105.01 mph (169 km/h) |
| 90 mph (144.84 km/h) | 111.19 mph (178.94 km/h) |
| 95 mph (152.89 km/h) | 117.37 mph (188.89 km/h) |
| 100 mph (160.93 km/h) | 123.55 mph (198.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2170 | 2521 | 2715 | 2835 | 2964 | 3056 | 3158 | 3278 | 3444 | 3610 | 3795 | 3943 | 4210 | 4506 | 4737 | 4884 | 4968 | 5272 | 5697 | 6620 |
Better Fuel Economy Factory Ratios Increased Power
