Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/80-15 | 31/7.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.17 (741) | 31.09 (789.74) | 1.92 (48.74) 6.6% |
| Width inches (mm) | 8.86 (225) | 7.52 (191) | -1.34 (-34) -15.1% |
| Circum. inches (mm) | 91.65 (2327.92) | 97.68 (2481.04) | 6.03 (153.12) 6.6% |
| Sidewall Height inches (mm) | 7.09 (180) | 8.05 (204.37) | 0.96 (24.37) 13.5% |
| Revolutions per mile (km) | 691.32 (429.57) | 648.66 (403.06) | -42.67 (-26.51) -6.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.32 mph (34.3 km/h) |
| 25 mph (40.23 km/h) | 26.64 mph (42.88 km/h) |
| 30 mph (48.28 km/h) | 31.97 mph (51.46 km/h) |
| 35 mph (56.33 km/h) | 37.3 mph (60.03 km/h) |
| 40 mph (64.37 km/h) | 42.63 mph (68.61 km/h) |
| 45 mph (72.42 km/h) | 47.96 mph (77.18 km/h) |
| 50 mph (80.47 km/h) | 53.29 mph (85.76 km/h) |
| 55 mph (88.51 km/h) | 58.62 mph (94.34 km/h) |
| 60 mph (96.56 km/h) | 63.95 mph (102.91 km/h) |
| 65 mph (104.61 km/h) | 69.28 mph (111.49 km/h) |
| 70 mph (112.65 km/h) | 74.6 mph (120.06 km/h) |
| 75 mph (120.7 km/h) | 79.93 mph (128.64 km/h) |
| 80 mph (128.75 km/h) | 85.26 mph (137.22 km/h) |
| 85 mph (136.79 km/h) | 90.59 mph (145.79 km/h) |
| 90 mph (144.84 km/h) | 95.92 mph (154.37 km/h) |
| 95 mph (152.89 km/h) | 101.25 mph (162.94 km/h) |
| 100 mph (160.93 km/h) | 106.58 mph (171.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1651 | 1918 | 2065 | 2156 | 2255 | 2325 | 2402 | 2494 | 2620 | 2746 | 2887 | 2999 | 3203 | 3428 | 3603 | 3716 | 3779 | 4011 | 4334 | 5036 |
Better Fuel Economy Factory Ratios Increased Power
