Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/70-17 | 31/12.5-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.71 (830.8) | 31.02 (787.96) | -1.69 (-42.84) -5.2% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 102.76 (2610.04) | 97.46 (2475.45) | -5.3 (-134.59) -5.2% |
| Sidewall Height inches (mm) | 7.85 (199.5) | 7.01 (178.08) | -0.84 (-21.42) -10.7% |
| Revolutions per mile (km) | 616.6 (383.14) | 650.12 (403.97) | 33.52 (20.83) 5.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.97 mph (30.53 km/h) |
| 25 mph (40.23 km/h) | 23.71 mph (38.16 km/h) |
| 30 mph (48.28 km/h) | 28.45 mph (45.79 km/h) |
| 35 mph (56.33 km/h) | 33.2 mph (53.42 km/h) |
| 40 mph (64.37 km/h) | 37.94 mph (61.05 km/h) |
| 45 mph (72.42 km/h) | 42.68 mph (68.69 km/h) |
| 50 mph (80.47 km/h) | 47.42 mph (76.32 km/h) |
| 55 mph (88.51 km/h) | 52.16 mph (83.95 km/h) |
| 60 mph (96.56 km/h) | 56.91 mph (91.58 km/h) |
| 65 mph (104.61 km/h) | 61.65 mph (99.21 km/h) |
| 70 mph (112.65 km/h) | 66.39 mph (106.85 km/h) |
| 75 mph (120.7 km/h) | 71.13 mph (114.48 km/h) |
| 80 mph (128.75 km/h) | 75.87 mph (122.11 km/h) |
| 85 mph (136.79 km/h) | 80.62 mph (129.74 km/h) |
| 90 mph (144.84 km/h) | 85.36 mph (137.37 km/h) |
| 95 mph (152.89 km/h) | 90.1 mph (145 km/h) |
| 100 mph (160.93 km/h) | 94.84 mph (152.64 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 | 2408 | 2499 | 2626 | 2753 | 2894 | 3006 | 3210 | 3436 | 3612 | 3724 | 3788 | 4020 | 4344 | 5048 |
Better Fuel Economy Factory Ratios Increased Power
