Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/55-20 | 34/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.64 (854.5) | 34.02 (864.16) | 0.38 (9.66) 1.1% |
| Width inches (mm) | 12.4 (315) | 12.52 (318) | 0.12 (3) 1% |
| Circum. inches (mm) | 105.69 (2684.49) | 106.88 (2714.84) | 1.19 (30.35) 1.1% |
| Sidewall Height inches (mm) | 6.82 (173.25) | 7.01 (178.08) | 0.19 (4.83) 2.8% |
| Revolutions per mile (km) | 599.5 (372.51) | 592.8 (368.35) | -6.7 (-4.16) -1.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.23 mph (32.55 km/h) |
| 25 mph (40.23 km/h) | 25.28 mph (40.69 km/h) |
| 30 mph (48.28 km/h) | 30.34 mph (48.83 km/h) |
| 35 mph (56.33 km/h) | 35.4 mph (56.96 km/h) |
| 40 mph (64.37 km/h) | 40.45 mph (65.1 km/h) |
| 45 mph (72.42 km/h) | 45.51 mph (73.24 km/h) |
| 50 mph (80.47 km/h) | 50.57 mph (81.38 km/h) |
| 55 mph (88.51 km/h) | 55.62 mph (89.51 km/h) |
| 60 mph (96.56 km/h) | 60.68 mph (97.65 km/h) |
| 65 mph (104.61 km/h) | 65.73 mph (105.79 km/h) |
| 70 mph (112.65 km/h) | 70.79 mph (113.93 km/h) |
| 75 mph (120.7 km/h) | 75.85 mph (122.07 km/h) |
| 80 mph (128.75 km/h) | 80.9 mph (130.2 km/h) |
| 85 mph (136.79 km/h) | 85.96 mph (138.34 km/h) |
| 90 mph (144.84 km/h) | 91.02 mph (146.48 km/h) |
| 95 mph (152.89 km/h) | 96.07 mph (154.62 km/h) |
| 100 mph (160.93 km/h) | 101.13 mph (162.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1509 | 1752 | 1887 | 1971 | 2061 | 2125 | 2195 | 2279 | 2394 | 2510 | 2638 | 2741 | 2927 | 3133 | 3293 | 3396 | 3454 | 3665 | 3961 | 4603 |
Better Fuel Economy Factory Ratios Increased Power
