Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/85-15 | 31/9.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.73 (780.5) | 30.94 (785.88) | 0.21 (5.38) 0.7% |
| Width inches (mm) | 9.25 (235) | 9.49 (241) | 0.24 (6) 2.6% |
| Circum. inches (mm) | 96.54 (2452.01) | 97.2 (2468.91) | 0.67 (16.9) 0.7% |
| Sidewall Height inches (mm) | 7.86 (199.75) | 7.97 (202.44) | 0.11 (2.69) 1.3% |
| Revolutions per mile (km) | 656.34 (407.83) | 651.84 (405.04) | -4.49 (-2.79) -0.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.14 mph (32.41 km/h) |
| 25 mph (40.23 km/h) | 25.17 mph (40.51 km/h) |
| 30 mph (48.28 km/h) | 30.21 mph (48.61 km/h) |
| 35 mph (56.33 km/h) | 35.24 mph (56.72 km/h) |
| 40 mph (64.37 km/h) | 40.28 mph (64.82 km/h) |
| 45 mph (72.42 km/h) | 45.31 mph (72.92 km/h) |
| 50 mph (80.47 km/h) | 50.34 mph (81.02 km/h) |
| 55 mph (88.51 km/h) | 55.38 mph (89.12 km/h) |
| 60 mph (96.56 km/h) | 60.41 mph (97.23 km/h) |
| 65 mph (104.61 km/h) | 65.45 mph (105.33 km/h) |
| 70 mph (112.65 km/h) | 70.48 mph (113.43 km/h) |
| 75 mph (120.7 km/h) | 75.52 mph (121.53 km/h) |
| 80 mph (128.75 km/h) | 80.55 mph (129.64 km/h) |
| 85 mph (136.79 km/h) | 85.59 mph (137.74 km/h) |
| 90 mph (144.84 km/h) | 90.62 mph (145.84 km/h) |
| 95 mph (152.89 km/h) | 95.65 mph (153.94 km/h) |
| 100 mph (160.93 km/h) | 100.69 mph (162.04 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
