Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/70-12 | 185/90-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.65 (549.8) | 25.11 (637.8) | 3.46 (88) 16% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 68 (1727.25) | 78.89 (2003.71) | 10.88 (276.46) 16% |
| Sidewall Height inches (mm) | 4.82 (122.5) | 6.56 (166.5) | 1.73 (44) 35.9% |
| Revolutions per mile (km) | 931.74 (578.95) | 803.18 (499.07) | -128.56 (-79.88) -13.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.2 mph (37.34 km/h) |
| 25 mph (40.23 km/h) | 29 mph (46.67 km/h) |
| 30 mph (48.28 km/h) | 34.8 mph (56.01 km/h) |
| 35 mph (56.33 km/h) | 40.6 mph (65.34 km/h) |
| 40 mph (64.37 km/h) | 46.4 mph (74.68 km/h) |
| 45 mph (72.42 km/h) | 52.2 mph (84.01 km/h) |
| 50 mph (80.47 km/h) | 58 mph (93.35 km/h) |
| 55 mph (88.51 km/h) | 63.8 mph (102.68 km/h) |
| 60 mph (96.56 km/h) | 69.6 mph (112.02 km/h) |
| 65 mph (104.61 km/h) | 75.4 mph (121.35 km/h) |
| 70 mph (112.65 km/h) | 81.2 mph (130.69 km/h) |
| 75 mph (120.7 km/h) | 87 mph (140.02 km/h) |
| 80 mph (128.75 km/h) | 92.8 mph (149.35 km/h) |
| 85 mph (136.79 km/h) | 98.6 mph (158.69 km/h) |
| 90 mph (144.84 km/h) | 104.41 mph (168.02 km/h) |
| 95 mph (152.89 km/h) | 110.21 mph (177.36 km/h) |
| 100 mph (160.93 km/h) | 116.01 mph (186.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2044 | 2374 | 2557 | 2670 | 2792 | 2879 | 2975 | 3088 | 3244 | 3401 | 3575 | 3714 | 3966 | 4244 | 4462 | 4601 | 4679 | 4966 | 5366 | 6236 |
Better Fuel Economy Factory Ratios Increased Power
