Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/50-12 | 215/40-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 20.46 (519.8) | 18.77 (476.8) | -1.69 (-43) -8.3% |
| Width inches (mm) | 8.46 (215) | 8.46 (215) | 0 (0) 0% |
| Circum. inches (mm) | 64.29 (1633) | 58.97 (1497.91) | -5.32 (-135.09) -8.3% |
| Sidewall Height inches (mm) | 4.23 (107.5) | 3.39 (86) | -0.85 (-21.5) -20% |
| Revolutions per mile (km) | 985.51 (612.37) | 1074.39 (667.59) | 88.88 (55.23) 9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.35 mph (29.52 km/h) |
| 25 mph (40.23 km/h) | 22.93 mph (36.91 km/h) |
| 30 mph (48.28 km/h) | 27.52 mph (44.29 km/h) |
| 35 mph (56.33 km/h) | 32.1 mph (51.67 km/h) |
| 40 mph (64.37 km/h) | 36.69 mph (59.05 km/h) |
| 45 mph (72.42 km/h) | 41.28 mph (66.43 km/h) |
| 50 mph (80.47 km/h) | 45.86 mph (73.81 km/h) |
| 55 mph (88.51 km/h) | 50.45 mph (81.19 km/h) |
| 60 mph (96.56 km/h) | 55.04 mph (88.57 km/h) |
| 65 mph (104.61 km/h) | 59.62 mph (95.95 km/h) |
| 70 mph (112.65 km/h) | 64.21 mph (103.34 km/h) |
| 75 mph (120.7 km/h) | 68.8 mph (110.72 km/h) |
| 80 mph (128.75 km/h) | 73.38 mph (118.1 km/h) |
| 85 mph (136.79 km/h) | 77.97 mph (125.48 km/h) |
| 90 mph (144.84 km/h) | 82.55 mph (132.86 km/h) |
| 95 mph (152.89 km/h) | 87.14 mph (140.24 km/h) |
| 100 mph (160.93 km/h) | 91.73 mph (147.62 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
