Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-19 | 305/40-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.6) | 28.61 (726.6) | 2.4 (61) 9.2% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 82.32 (2091.04) | 89.87 (2282.68) | 7.54 (191.64) 9.2% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 4.8 (122) | 1.2 (30.5) 33.3% |
| Revolutions per mile (km) | 769.64 (478.23) | 705.02 (438.08) | -64.61 (-40.15) -8.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.83 mph (35.14 km/h) |
| 25 mph (40.23 km/h) | 27.29 mph (43.92 km/h) |
| 30 mph (48.28 km/h) | 32.75 mph (52.71 km/h) |
| 35 mph (56.33 km/h) | 38.21 mph (61.49 km/h) |
| 40 mph (64.37 km/h) | 43.67 mph (70.27 km/h) |
| 45 mph (72.42 km/h) | 49.12 mph (79.06 km/h) |
| 50 mph (80.47 km/h) | 54.58 mph (87.84 km/h) |
| 55 mph (88.51 km/h) | 60.04 mph (96.63 km/h) |
| 60 mph (96.56 km/h) | 65.5 mph (105.41 km/h) |
| 65 mph (104.61 km/h) | 70.96 mph (114.19 km/h) |
| 70 mph (112.65 km/h) | 76.42 mph (122.98 km/h) |
| 75 mph (120.7 km/h) | 81.87 mph (131.76 km/h) |
| 80 mph (128.75 km/h) | 87.33 mph (140.55 km/h) |
| 85 mph (136.79 km/h) | 92.79 mph (149.33 km/h) |
| 90 mph (144.84 km/h) | 98.25 mph (158.12 km/h) |
| 95 mph (152.89 km/h) | 103.71 mph (166.9 km/h) |
| 100 mph (160.93 km/h) | 109.16 mph (175.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1794 | 2084 | 2245 | 2344 | 2451 | 2527 | 2611 | 2710 | 2848 | 2985 | 3138 | 3260 | 3481 | 3726 | 3917 | 4039 | 4107 | 4359 | 4711 | 5474 |
Better Fuel Economy Factory Ratios Increased Power
