Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/70-12 | 185/80-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.65 (549.8) | 23.65 (600.8) | 2.01 (51) 9.3% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 68 (1727.25) | 74.31 (1887.47) | 6.31 (160.22) 9.3% |
| Sidewall Height inches (mm) | 4.82 (122.5) | 5.83 (148) | 1 (25.5) 20.8% |
| Revolutions per mile (km) | 931.74 (578.95) | 852.65 (529.81) | -79.09 (-49.15) -8.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.86 mph (35.17 km/h) |
| 25 mph (40.23 km/h) | 27.32 mph (43.97 km/h) |
| 30 mph (48.28 km/h) | 32.78 mph (52.76 km/h) |
| 35 mph (56.33 km/h) | 38.25 mph (61.55 km/h) |
| 40 mph (64.37 km/h) | 43.71 mph (70.35 km/h) |
| 45 mph (72.42 km/h) | 49.17 mph (79.14 km/h) |
| 50 mph (80.47 km/h) | 54.64 mph (87.93 km/h) |
| 55 mph (88.51 km/h) | 60.1 mph (96.72 km/h) |
| 60 mph (96.56 km/h) | 65.57 mph (105.52 km/h) |
| 65 mph (104.61 km/h) | 71.03 mph (114.31 km/h) |
| 70 mph (112.65 km/h) | 76.49 mph (123.1 km/h) |
| 75 mph (120.7 km/h) | 81.96 mph (131.9 km/h) |
| 80 mph (128.75 km/h) | 87.42 mph (140.69 km/h) |
| 85 mph (136.79 km/h) | 92.88 mph (149.48 km/h) |
| 90 mph (144.84 km/h) | 98.35 mph (158.28 km/h) |
| 95 mph (152.89 km/h) | 103.81 mph (167.07 km/h) |
| 100 mph (160.93 km/h) | 109.28 mph (175.86 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
