Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/75-15 | 31/9.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.88 (733.5) | 30.94 (785.88) | 2.06 (52.38) 7.1% |
| Width inches (mm) | 9.25 (235) | 9.49 (241) | 0.24 (6) 2.6% |
| Circum. inches (mm) | 90.72 (2304.36) | 97.2 (2468.91) | 6.48 (164.56) 7.1% |
| Sidewall Height inches (mm) | 6.94 (176.25) | 7.97 (202.44) | 1.03 (26.19) 14.9% |
| Revolutions per mile (km) | 698.39 (433.96) | 651.84 (405.04) | -46.55 (-28.92) -6.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.43 mph (34.49 km/h) |
| 25 mph (40.23 km/h) | 26.79 mph (43.11 km/h) |
| 30 mph (48.28 km/h) | 32.14 mph (51.73 km/h) |
| 35 mph (56.33 km/h) | 37.5 mph (60.35 km/h) |
| 40 mph (64.37 km/h) | 42.86 mph (68.97 km/h) |
| 45 mph (72.42 km/h) | 48.21 mph (77.59 km/h) |
| 50 mph (80.47 km/h) | 53.57 mph (86.21 km/h) |
| 55 mph (88.51 km/h) | 58.93 mph (94.83 km/h) |
| 60 mph (96.56 km/h) | 64.28 mph (103.46 km/h) |
| 65 mph (104.61 km/h) | 69.64 mph (112.08 km/h) |
| 70 mph (112.65 km/h) | 75 mph (120.7 km/h) |
| 75 mph (120.7 km/h) | 80.36 mph (129.32 km/h) |
| 80 mph (128.75 km/h) | 85.71 mph (137.94 km/h) |
| 85 mph (136.79 km/h) | 91.07 mph (146.56 km/h) |
| 90 mph (144.84 km/h) | 96.43 mph (155.18 km/h) |
| 95 mph (152.89 km/h) | 101.78 mph (163.81 km/h) |
| 100 mph (160.93 km/h) | 107.14 mph (172.43 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1659 | 1927 | 2075 | 2167 | 2266 | 2336 | 2414 | 2506 | 2633 | 2760 | 2901 | 3014 | 3219 | 3445 | 3621 | 3734 | 3798 | 4031 | 4355 | 5061 |
Better Fuel Economy Factory Ratios Increased Power
