Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/80-12 | 30/10-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.91 (632.8) | 30 (762) | 5.09 (129.2) 20.4% |
| Width inches (mm) | 8.07 (205) | 10 (254) | 1.93 (49) 23.9% |
| Circum. inches (mm) | 78.27 (1988) | 94.25 (2393.89) | 15.98 (405.89) 20.4% |
| Sidewall Height inches (mm) | 6.46 (164) | 9 (228.6) | 2.54 (64.6) 39.4% |
| Revolutions per mile (km) | 809.53 (503.02) | 672.27 (417.73) | -137.26 (-85.29) -17% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.08 mph (38.76 km/h) |
| 25 mph (40.23 km/h) | 30.1 mph (48.45 km/h) |
| 30 mph (48.28 km/h) | 36.13 mph (58.14 km/h) |
| 35 mph (56.33 km/h) | 42.15 mph (67.83 km/h) |
| 40 mph (64.37 km/h) | 48.17 mph (77.52 km/h) |
| 45 mph (72.42 km/h) | 54.19 mph (87.21 km/h) |
| 50 mph (80.47 km/h) | 60.21 mph (96.9 km/h) |
| 55 mph (88.51 km/h) | 66.23 mph (106.59 km/h) |
| 60 mph (96.56 km/h) | 72.25 mph (116.28 km/h) |
| 65 mph (104.61 km/h) | 78.27 mph (125.97 km/h) |
| 70 mph (112.65 km/h) | 84.29 mph (135.66 km/h) |
| 75 mph (120.7 km/h) | 90.31 mph (145.34 km/h) |
| 80 mph (128.75 km/h) | 96.33 mph (155.03 km/h) |
| 85 mph (136.79 km/h) | 102.35 mph (164.72 km/h) |
| 90 mph (144.84 km/h) | 108.38 mph (174.41 km/h) |
| 95 mph (152.89 km/h) | 114.4 mph (184.1 km/h) |
| 100 mph (160.93 km/h) | 120.42 mph (193.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1711 | 1987 | 2140 | 2235 | 2337 | 2410 | 2490 | 2584 | 2715 | 2846 | 2992 | 3109 | 3320 | 3553 | 3735 | 3851 | 3917 | 4157 | 4492 | 5220 |
Better Fuel Economy Factory Ratios Increased Power
