Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/65-20 | 35/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.59 (878.5) | 35.02 (889.6) | 0.44 (11.1) 1.3% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 108.66 (2759.89) | 110.03 (2794.76) | 1.37 (34.87) 1.3% |
| Sidewall Height inches (mm) | 7.29 (185.25) | 7.51 (190.8) | 0.22 (5.55) 3% |
| Revolutions per mile (km) | 583.12 (362.33) | 575.84 (357.81) | -7.28 (-4.52) -1.2% |
35/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.25 mph (32.59 km/h) |
| 25 mph (40.23 km/h) | 25.32 mph (40.74 km/h) |
| 30 mph (48.28 km/h) | 30.38 mph (48.89 km/h) |
| 35 mph (56.33 km/h) | 35.44 mph (57.04 km/h) |
| 40 mph (64.37 km/h) | 40.51 mph (65.19 km/h) |
| 45 mph (72.42 km/h) | 45.57 mph (73.34 km/h) |
| 50 mph (80.47 km/h) | 50.63 mph (81.48 km/h) |
| 55 mph (88.51 km/h) | 55.69 mph (89.63 km/h) |
| 60 mph (96.56 km/h) | 60.76 mph (97.78 km/h) |
| 65 mph (104.61 km/h) | 65.82 mph (105.93 km/h) |
| 70 mph (112.65 km/h) | 70.88 mph (114.08 km/h) |
| 75 mph (120.7 km/h) | 75.95 mph (122.23 km/h) |
| 80 mph (128.75 km/h) | 81.01 mph (130.37 km/h) |
| 85 mph (136.79 km/h) | 86.07 mph (138.52 km/h) |
| 90 mph (144.84 km/h) | 91.14 mph (146.67 km/h) |
| 95 mph (152.89 km/h) | 96.2 mph (154.82 km/h) |
| 100 mph (160.93 km/h) | 101.26 mph (162.97 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1465 | 1702 | 1833 | 1914 | 2002 | 2064 | 2133 | 2214 | 2326 | 2438 | 2563 | 2663 | 2844 | 3043 | 3199 | 3299 | 3355 | 3561 | 3847 | 4471 |
Better Fuel Economy Factory Ratios Increased Power
