Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/50-12 | 230/30-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 20.46 (519.8) | 17.43 (442.8) | -3.03 (-77) -14.8% |
| Width inches (mm) | 8.46 (215) | 9.06 (230) | 0.59 (15) 7% |
| Circum. inches (mm) | 64.29 (1633) | 54.77 (1391.1) | -9.52 (-241.9) -14.8% |
| Sidewall Height inches (mm) | 4.23 (107.5) | 2.72 (69) | -1.52 (-38.5) -35.8% |
| Revolutions per mile (km) | 985.51 (612.37) | 1156.89 (718.86) | 171.37 (106.49) 17.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.04 mph (27.42 km/h) |
| 25 mph (40.23 km/h) | 21.3 mph (34.27 km/h) |
| 30 mph (48.28 km/h) | 25.56 mph (41.13 km/h) |
| 35 mph (56.33 km/h) | 29.82 mph (47.98 km/h) |
| 40 mph (64.37 km/h) | 34.07 mph (54.84 km/h) |
| 45 mph (72.42 km/h) | 38.33 mph (61.69 km/h) |
| 50 mph (80.47 km/h) | 42.59 mph (68.55 km/h) |
| 55 mph (88.51 km/h) | 46.85 mph (75.4 km/h) |
| 60 mph (96.56 km/h) | 51.11 mph (82.26 km/h) |
| 65 mph (104.61 km/h) | 55.37 mph (89.11 km/h) |
| 70 mph (112.65 km/h) | 59.63 mph (95.97 km/h) |
| 75 mph (120.7 km/h) | 63.89 mph (102.82 km/h) |
| 80 mph (128.75 km/h) | 68.15 mph (109.68 km/h) |
| 85 mph (136.79 km/h) | 72.41 mph (116.53 km/h) |
| 90 mph (144.84 km/h) | 76.67 mph (123.39 km/h) |
| 95 mph (152.89 km/h) | 80.93 mph (130.24 km/h) |
| 100 mph (160.93 km/h) | 85.19 mph (137.09 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
