Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 315/30-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 29.44 (747.8) | 0.76 (19.4) 2.7% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 90.09 (2288.34) | 92.49 (2349.28) | 2.4 (60.95) 2.7% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.72 (94.5) | -0.12 (-3) -3.1% |
| Revolutions per mile (km) | 703.28 (437) | 685.04 (425.66) | -18.25 (-11.34) -2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.53 mph (33.04 km/h) |
| 25 mph (40.23 km/h) | 25.67 mph (41.31 km/h) |
| 30 mph (48.28 km/h) | 30.8 mph (49.57 km/h) |
| 35 mph (56.33 km/h) | 35.93 mph (57.83 km/h) |
| 40 mph (64.37 km/h) | 41.07 mph (66.09 km/h) |
| 45 mph (72.42 km/h) | 46.2 mph (74.35 km/h) |
| 50 mph (80.47 km/h) | 51.33 mph (82.61 km/h) |
| 55 mph (88.51 km/h) | 56.46 mph (90.87 km/h) |
| 60 mph (96.56 km/h) | 61.6 mph (99.13 km/h) |
| 65 mph (104.61 km/h) | 66.73 mph (107.39 km/h) |
| 70 mph (112.65 km/h) | 71.86 mph (115.65 km/h) |
| 75 mph (120.7 km/h) | 77 mph (123.92 km/h) |
| 80 mph (128.75 km/h) | 82.13 mph (132.18 km/h) |
| 85 mph (136.79 km/h) | 87.26 mph (140.44 km/h) |
| 90 mph (144.84 km/h) | 92.4 mph (148.7 km/h) |
| 95 mph (152.89 km/h) | 97.53 mph (156.96 km/h) |
| 100 mph (160.93 km/h) | 102.66 mph (165.22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1743 | 2025 | 2181 | 2277 | 2381 | 2455 | 2537 | 2633 | 2767 | 2901 | 3049 | 3168 | 3383 | 3620 | 3806 | 3924 | 3991 | 4236 | 4577 | 5319 |
Better Fuel Economy Factory Ratios Increased Power
