Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/40-12 | 225/30-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 18.77 (476.8) | 17.31 (439.8) | -1.46 (-37) -7.8% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 58.97 (1497.91) | 54.4 (1381.67) | -4.58 (-116.24) -7.8% |
| Sidewall Height inches (mm) | 3.39 (86) | 2.66 (67.5) | -0.73 (-18.5) -21.5% |
| Revolutions per mile (km) | 1074.39 (667.59) | 1164.78 (723.76) | 90.39 (56.16) 8.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.45 mph (29.69 km/h) |
| 25 mph (40.23 km/h) | 23.06 mph (37.11 km/h) |
| 30 mph (48.28 km/h) | 27.67 mph (44.53 km/h) |
| 35 mph (56.33 km/h) | 32.28 mph (51.96 km/h) |
| 40 mph (64.37 km/h) | 36.9 mph (59.38 km/h) |
| 45 mph (72.42 km/h) | 41.51 mph (66.8 km/h) |
| 50 mph (80.47 km/h) | 46.12 mph (74.22 km/h) |
| 55 mph (88.51 km/h) | 50.73 mph (81.65 km/h) |
| 60 mph (96.56 km/h) | 55.34 mph (89.07 km/h) |
| 65 mph (104.61 km/h) | 59.96 mph (96.49 km/h) |
| 70 mph (112.65 km/h) | 64.57 mph (103.91 km/h) |
| 75 mph (120.7 km/h) | 69.18 mph (111.33 km/h) |
| 80 mph (128.75 km/h) | 73.79 mph (118.76 km/h) |
| 85 mph (136.79 km/h) | 78.4 mph (126.18 km/h) |
| 90 mph (144.84 km/h) | 83.02 mph (133.6 km/h) |
| 95 mph (152.89 km/h) | 87.63 mph (141.02 km/h) |
| 100 mph (160.93 km/h) | 92.24 mph (148.45 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
