Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/75-15 | 31/12.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.6 (853.5) | 31.03 (788.04) | -2.58 (-65.46) -7.7% |
| Width inches (mm) | 12.4 (315) | 12.52 (318) | 0.12 (3) 1% |
| Circum. inches (mm) | 105.56 (2681.35) | 97.47 (2475.7) | -8.1 (-205.65) -7.7% |
| Sidewall Height inches (mm) | 9.3 (236.25) | 8.01 (203.52) | -1.29 (-32.73) -13.9% |
| Revolutions per mile (km) | 600.2 (372.95) | 650.06 (403.93) | 49.86 (30.98) 8.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.47 mph (29.72 km/h) |
| 25 mph (40.23 km/h) | 23.08 mph (37.15 km/h) |
| 30 mph (48.28 km/h) | 27.7 mph (44.58 km/h) |
| 35 mph (56.33 km/h) | 32.32 mph (52.01 km/h) |
| 40 mph (64.37 km/h) | 36.93 mph (59.44 km/h) |
| 45 mph (72.42 km/h) | 41.55 mph (66.87 km/h) |
| 50 mph (80.47 km/h) | 46.17 mph (74.3 km/h) |
| 55 mph (88.51 km/h) | 50.78 mph (81.73 km/h) |
| 60 mph (96.56 km/h) | 55.4 mph (89.16 km/h) |
| 65 mph (104.61 km/h) | 60.01 mph (96.58 km/h) |
| 70 mph (112.65 km/h) | 64.63 mph (104.01 km/h) |
| 75 mph (120.7 km/h) | 69.25 mph (111.44 km/h) |
| 80 mph (128.75 km/h) | 73.86 mph (118.87 km/h) |
| 85 mph (136.79 km/h) | 78.48 mph (126.3 km/h) |
| 90 mph (144.84 km/h) | 83.1 mph (133.73 km/h) |
| 95 mph (152.89 km/h) | 87.71 mph (141.16 km/h) |
| 100 mph (160.93 km/h) | 92.33 mph (148.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1654 | 1922 | 2070 | 2161 | 2260 | 2330 | 2407 | 2499 | 2626 | 2752 | 2893 | 3006 | 3210 | 3435 | 3611 | 3724 | 3787 | 4020 | 4343 | 5047 |
Better Fuel Economy Factory Ratios Increased Power
