Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 33/10.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 33.03 (839.08) | 3.43 (87.08) 11.6% |
| Width inches (mm) | 12.01 (305) | 10.51 (267) | -1.5 (-38) -12.5% |
| Circum. inches (mm) | 93.01 (2362.48) | 103.78 (2636.05) | 10.77 (273.57) 11.6% |
| Sidewall Height inches (mm) | 4.8 (122) | 6.52 (165.54) | 1.71 (43.54) 35.7% |
| Revolutions per mile (km) | 681.21 (423.28) | 610.51 (379.36) | -70.7 (-43.93) -10.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.32 mph (35.91 km/h) |
| 25 mph (40.23 km/h) | 27.89 mph (44.89 km/h) |
| 30 mph (48.28 km/h) | 33.47 mph (53.87 km/h) |
| 35 mph (56.33 km/h) | 39.05 mph (62.85 km/h) |
| 40 mph (64.37 km/h) | 44.63 mph (71.83 km/h) |
| 45 mph (72.42 km/h) | 50.21 mph (80.81 km/h) |
| 50 mph (80.47 km/h) | 55.79 mph (89.79 km/h) |
| 55 mph (88.51 km/h) | 61.37 mph (98.76 km/h) |
| 60 mph (96.56 km/h) | 66.95 mph (107.74 km/h) |
| 65 mph (104.61 km/h) | 72.53 mph (116.72 km/h) |
| 70 mph (112.65 km/h) | 78.11 mph (125.7 km/h) |
| 75 mph (120.7 km/h) | 83.68 mph (134.68 km/h) |
| 80 mph (128.75 km/h) | 89.26 mph (143.66 km/h) |
| 85 mph (136.79 km/h) | 94.84 mph (152.64 km/h) |
| 90 mph (144.84 km/h) | 100.42 mph (161.61 km/h) |
| 95 mph (152.89 km/h) | 106 mph (170.59 km/h) |
| 100 mph (160.93 km/h) | 111.58 mph (179.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1554 | 1805 | 1944 | 2030 | 2122 | 2188 | 2261 | 2347 | 2466 | 2585 | 2717 | 2823 | 3015 | 3226 | 3392 | 3497 | 3557 | 3775 | 4079 | 4740 |
Better Fuel Economy Factory Ratios Increased Power
