Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 305/20-30 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 34.8 (884) | -2.64 (-67) -7% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 117.62 (2987.65) | 109.34 (2777.17) | -8.29 (-210.49) -7% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 2.4 (61) | -1.32 (-33.5) -35.4% |
| Revolutions per mile (km) | 538.66 (334.71) | 579.49 (360.08) | 40.83 (25.37) 7.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.59 mph (29.92 km/h) |
| 25 mph (40.23 km/h) | 23.24 mph (37.4 km/h) |
| 30 mph (48.28 km/h) | 27.89 mph (44.88 km/h) |
| 35 mph (56.33 km/h) | 32.53 mph (52.36 km/h) |
| 40 mph (64.37 km/h) | 37.18 mph (59.84 km/h) |
| 45 mph (72.42 km/h) | 41.83 mph (67.32 km/h) |
| 50 mph (80.47 km/h) | 46.48 mph (74.8 km/h) |
| 55 mph (88.51 km/h) | 51.13 mph (82.28 km/h) |
| 60 mph (96.56 km/h) | 55.77 mph (89.76 km/h) |
| 65 mph (104.61 km/h) | 60.42 mph (97.24 km/h) |
| 70 mph (112.65 km/h) | 65.07 mph (104.72 km/h) |
| 75 mph (120.7 km/h) | 69.72 mph (112.2 km/h) |
| 80 mph (128.75 km/h) | 74.36 mph (119.68 km/h) |
| 85 mph (136.79 km/h) | 79.01 mph (127.16 km/h) |
| 90 mph (144.84 km/h) | 83.66 mph (134.64 km/h) |
| 95 mph (152.89 km/h) | 88.31 mph (142.12 km/h) |
| 100 mph (160.93 km/h) | 92.95 mph (149.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1475 | 1713 | 1845 | 1927 | 2014 | 2077 | 2146 | 2228 | 2341 | 2454 | 2579 | 2680 | 2862 | 3062 | 3219 | 3320 | 3376 | 3583 | 3872 | 4499 |
Better Fuel Economy Factory Ratios Increased Power
