Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/40-12 | 205/30-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 18.77 (476.8) | 16.84 (427.8) | -1.93 (-49) -10.3% |
| Width inches (mm) | 8.46 (215) | 8.07 (205) | -0.39 (-10) -4.7% |
| Circum. inches (mm) | 58.97 (1497.91) | 52.91 (1343.97) | -6.06 (-153.94) -10.3% |
| Sidewall Height inches (mm) | 3.39 (86) | 2.42 (61.5) | -0.96 (-24.5) -28.5% |
| Revolutions per mile (km) | 1074.39 (667.59) | 1197.45 (744.06) | 123.06 (76.47) 11.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.94 mph (28.88 km/h) |
| 25 mph (40.23 km/h) | 22.43 mph (36.1 km/h) |
| 30 mph (48.28 km/h) | 26.92 mph (43.32 km/h) |
| 35 mph (56.33 km/h) | 31.4 mph (50.54 km/h) |
| 40 mph (64.37 km/h) | 35.89 mph (57.76 km/h) |
| 45 mph (72.42 km/h) | 40.38 mph (64.98 km/h) |
| 50 mph (80.47 km/h) | 44.86 mph (72.2 km/h) |
| 55 mph (88.51 km/h) | 49.35 mph (79.42 km/h) |
| 60 mph (96.56 km/h) | 53.83 mph (86.64 km/h) |
| 65 mph (104.61 km/h) | 58.32 mph (93.86 km/h) |
| 70 mph (112.65 km/h) | 62.81 mph (101.08 km/h) |
| 75 mph (120.7 km/h) | 67.29 mph (108.3 km/h) |
| 80 mph (128.75 km/h) | 71.78 mph (115.52 km/h) |
| 85 mph (136.79 km/h) | 76.26 mph (122.74 km/h) |
| 90 mph (144.84 km/h) | 80.75 mph (129.96 km/h) |
| 95 mph (152.89 km/h) | 85.24 mph (137.18 km/h) |
| 100 mph (160.93 km/h) | 89.72 mph (144.4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
