Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/55-20 | 34/12-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.64 (854.5) | 33.93 (861.8) | 0.29 (7.3) 0.9% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 105.69 (2684.49) | 106.59 (2707.42) | 0.9 (22.93) 0.9% |
| Sidewall Height inches (mm) | 6.82 (173.25) | 6.96 (176.9) | 0.14 (3.65) 2.1% |
| Revolutions per mile (km) | 599.5 (372.51) | 594.42 (369.35) | -5.08 (-3.16) -0.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.17 mph (32.46 km/h) |
| 25 mph (40.23 km/h) | 25.21 mph (40.58 km/h) |
| 30 mph (48.28 km/h) | 30.26 mph (48.69 km/h) |
| 35 mph (56.33 km/h) | 35.3 mph (56.81 km/h) |
| 40 mph (64.37 km/h) | 40.34 mph (64.92 km/h) |
| 45 mph (72.42 km/h) | 45.38 mph (73.04 km/h) |
| 50 mph (80.47 km/h) | 50.43 mph (81.15 km/h) |
| 55 mph (88.51 km/h) | 55.47 mph (89.27 km/h) |
| 60 mph (96.56 km/h) | 60.51 mph (97.39 km/h) |
| 65 mph (104.61 km/h) | 65.56 mph (105.5 km/h) |
| 70 mph (112.65 km/h) | 70.6 mph (113.62 km/h) |
| 75 mph (120.7 km/h) | 75.64 mph (121.73 km/h) |
| 80 mph (128.75 km/h) | 80.68 mph (129.85 km/h) |
| 85 mph (136.79 km/h) | 85.73 mph (137.96 km/h) |
| 90 mph (144.84 km/h) | 90.77 mph (146.08 km/h) |
| 95 mph (152.89 km/h) | 95.81 mph (154.19 km/h) |
| 100 mph (160.93 km/h) | 100.85 mph (162.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1513 | 1757 | 1892 | 1976 | 2066 | 2131 | 2201 | 2285 | 2401 | 2517 | 2646 | 2749 | 2935 | 3141 | 3302 | 3405 | 3463 | 3675 | 3972 | 4615 |
Better Fuel Economy Factory Ratios Increased Power
