Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 285/40-28 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 36.98 (939.2) | -0.46 (-11.8) -1.2% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 117.62 (2987.65) | 116.16 (2950.58) | -1.46 (-37.07) -1.2% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 4.49 (114) | 0.77 (19.5) 20.6% |
| Revolutions per mile (km) | 538.66 (334.71) | 545.43 (338.92) | 6.77 (4.21) 1.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.75 mph (31.79 km/h) |
| 25 mph (40.23 km/h) | 24.69 mph (39.73 km/h) |
| 30 mph (48.28 km/h) | 29.63 mph (47.68 km/h) |
| 35 mph (56.33 km/h) | 34.57 mph (55.63 km/h) |
| 40 mph (64.37 km/h) | 39.5 mph (63.58 km/h) |
| 45 mph (72.42 km/h) | 44.44 mph (71.52 km/h) |
| 50 mph (80.47 km/h) | 49.38 mph (79.47 km/h) |
| 55 mph (88.51 km/h) | 54.32 mph (87.42 km/h) |
| 60 mph (96.56 km/h) | 59.26 mph (95.36 km/h) |
| 65 mph (104.61 km/h) | 64.19 mph (103.31 km/h) |
| 70 mph (112.65 km/h) | 69.13 mph (111.26 km/h) |
| 75 mph (120.7 km/h) | 74.07 mph (119.2 km/h) |
| 80 mph (128.75 km/h) | 79.01 mph (127.15 km/h) |
| 85 mph (136.79 km/h) | 83.95 mph (135.1 km/h) |
| 90 mph (144.84 km/h) | 88.88 mph (143.04 km/h) |
| 95 mph (152.89 km/h) | 93.82 mph (150.99 km/h) |
| 100 mph (160.93 km/h) | 98.76 mph (158.94 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1388 | 1612 | 1737 | 1813 | 1896 | 1955 | 2020 | 2097 | 2203 | 2309 | 2428 | 2522 | 2693 | 2882 | 3030 | 3125 | 3178 | 3373 | 3644 | 4235 |
Better Fuel Economy Factory Ratios Increased Power
