Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/85-14 | 30/8.5-14 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.39 (721.1) | 29.99 (761.68) | 1.6 (40.58) 5.6% |
| Width inches (mm) | 8.46 (215) | 8.5 (216) | 0.04 (1) 0.5% |
| Circum. inches (mm) | 89.19 (2265.4) | 94.21 (2392.89) | 5.02 (127.49) 5.6% |
| Sidewall Height inches (mm) | 7.19 (182.75) | 7.99 (203.04) | 0.8 (20.29) 11.1% |
| Revolutions per mile (km) | 710.4 (441.42) | 672.55 (417.9) | -37.85 (-23.52) -5.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.13 mph (34 km/h) |
| 25 mph (40.23 km/h) | 26.41 mph (42.5 km/h) |
| 30 mph (48.28 km/h) | 31.69 mph (51 km/h) |
| 35 mph (56.33 km/h) | 36.97 mph (59.5 km/h) |
| 40 mph (64.37 km/h) | 42.25 mph (68 km/h) |
| 45 mph (72.42 km/h) | 47.53 mph (76.5 km/h) |
| 50 mph (80.47 km/h) | 52.81 mph (85 km/h) |
| 55 mph (88.51 km/h) | 58.1 mph (93.5 km/h) |
| 60 mph (96.56 km/h) | 63.38 mph (101.99 km/h) |
| 65 mph (104.61 km/h) | 68.66 mph (110.49 km/h) |
| 70 mph (112.65 km/h) | 73.94 mph (118.99 km/h) |
| 75 mph (120.7 km/h) | 79.22 mph (127.49 km/h) |
| 80 mph (128.75 km/h) | 84.5 mph (135.99 km/h) |
| 85 mph (136.79 km/h) | 89.78 mph (144.49 km/h) |
| 90 mph (144.84 km/h) | 95.06 mph (152.99 km/h) |
| 95 mph (152.89 km/h) | 100.35 mph (161.49 km/h) |
| 100 mph (160.93 km/h) | 105.63 mph (169.99 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1712 | 1988 | 2141 | 2236 | 2338 | 2411 | 2491 | 2585 | 2717 | 2848 | 2993 | 3110 | 3321 | 3554 | 3736 | 3853 | 3918 | 4159 | 4494 | 5222 |
Better Fuel Economy Factory Ratios Increased Power
