Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/30-20 | 315/30-30 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.31 (643) | 37.44 (951) | 12.13 (308) 47.9% |
| Width inches (mm) | 8.86 (225) | 12.4 (315) | 3.54 (90) 40% |
| Circum. inches (mm) | 79.53 (2020.04) | 117.62 (2987.65) | 38.09 (967.61) 47.9% |
| Sidewall Height inches (mm) | 2.66 (67.5) | 3.72 (94.5) | 1.06 (27) 40% |
| Revolutions per mile (km) | 796.69 (495.04) | 538.66 (334.71) | -258.02 (-160.33) -32.4% |
315/30-30 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 29.58 mph (47.6 km/h) |
| 25 mph (40.23 km/h) | 36.98 mph (59.51 km/h) |
| 30 mph (48.28 km/h) | 44.37 mph (71.41 km/h) |
| 35 mph (56.33 km/h) | 51.77 mph (83.31 km/h) |
| 40 mph (64.37 km/h) | 59.16 mph (95.21 km/h) |
| 45 mph (72.42 km/h) | 66.56 mph (107.11 km/h) |
| 50 mph (80.47 km/h) | 73.95 mph (119.01 km/h) |
| 55 mph (88.51 km/h) | 81.35 mph (130.91 km/h) |
| 60 mph (96.56 km/h) | 88.74 mph (142.81 km/h) |
| 65 mph (104.61 km/h) | 96.14 mph (154.72 km/h) |
| 70 mph (112.65 km/h) | 103.53 mph (166.62 km/h) |
| 75 mph (120.7 km/h) | 110.93 mph (178.52 km/h) |
| 80 mph (128.75 km/h) | 118.32 mph (190.42 km/h) |
| 85 mph (136.79 km/h) | 125.72 mph (202.32 km/h) |
| 90 mph (144.84 km/h) | 133.11 mph (214.22 km/h) |
| 95 mph (152.89 km/h) | 140.51 mph (226.12 km/h) |
| 100 mph (160.93 km/h) | 147.9 mph (238.02 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1371 | 1592 | 1715 | 1791 | 1872 | 1931 | 1995 | 2071 | 2176 | 2281 | 2397 | 2491 | 2660 | 2847 | 2992 | 3086 | 3138 | 3331 | 3599 | 4182 |
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