Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 35/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 35.02 (889.6) | 5.42 (137.6) 18.3% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 93.01 (2362.48) | 110.03 (2794.76) | 17.02 (432.28) 18.3% |
| Sidewall Height inches (mm) | 4.8 (122) | 7.51 (190.8) | 2.71 (68.8) 56.4% |
| Revolutions per mile (km) | 681.21 (423.28) | 575.84 (357.81) | -105.37 (-65.47) -15.5% |
35/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.66 mph (38.08 km/h) |
| 25 mph (40.23 km/h) | 29.57 mph (47.6 km/h) |
| 30 mph (48.28 km/h) | 35.49 mph (57.11 km/h) |
| 35 mph (56.33 km/h) | 41.4 mph (66.63 km/h) |
| 40 mph (64.37 km/h) | 47.32 mph (76.15 km/h) |
| 45 mph (72.42 km/h) | 53.23 mph (85.67 km/h) |
| 50 mph (80.47 km/h) | 59.15 mph (95.19 km/h) |
| 55 mph (88.51 km/h) | 65.06 mph (104.71 km/h) |
| 60 mph (96.56 km/h) | 70.98 mph (114.23 km/h) |
| 65 mph (104.61 km/h) | 76.89 mph (123.75 km/h) |
| 70 mph (112.65 km/h) | 82.81 mph (133.27 km/h) |
| 75 mph (120.7 km/h) | 88.72 mph (142.79 km/h) |
| 80 mph (128.75 km/h) | 94.64 mph (152.31 km/h) |
| 85 mph (136.79 km/h) | 100.55 mph (161.82 km/h) |
| 90 mph (144.84 km/h) | 106.47 mph (171.34 km/h) |
| 95 mph (152.89 km/h) | 112.38 mph (180.86 km/h) |
| 100 mph (160.93 km/h) | 118.3 mph (190.38 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
