Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/35-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.41 (721.5) | 27.2 (691) | -1.2 (-30.5) -4.2% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 89.24 (2266.66) | 85.47 (2170.84) | -3.77 (-95.82) -4.2% |
| Sidewall Height inches (mm) | 4.2 (106.75) | 3.6 (91.5) | -0.6 (-15.25) -14.3% |
| Revolutions per mile (km) | 710.01 (441.18) | 741.35 (460.65) | 31.34 (19.47) 4.4% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.15 mph (30.83 km/h) |
| 25 mph (40.23 km/h) | 23.94 mph (38.53 km/h) |
| 30 mph (48.28 km/h) | 28.73 mph (46.24 km/h) |
| 35 mph (56.33 km/h) | 33.52 mph (53.95 km/h) |
| 40 mph (64.37 km/h) | 38.31 mph (61.65 km/h) |
| 45 mph (72.42 km/h) | 43.1 mph (69.36 km/h) |
| 50 mph (80.47 km/h) | 47.89 mph (77.07 km/h) |
| 55 mph (88.51 km/h) | 52.67 mph (84.77 km/h) |
| 60 mph (96.56 km/h) | 57.46 mph (92.48 km/h) |
| 65 mph (104.61 km/h) | 62.25 mph (100.19 km/h) |
| 70 mph (112.65 km/h) | 67.04 mph (107.89 km/h) |
| 75 mph (120.7 km/h) | 71.83 mph (115.6 km/h) |
| 80 mph (128.75 km/h) | 76.62 mph (123.31 km/h) |
| 85 mph (136.79 km/h) | 81.41 mph (131.01 km/h) |
| 90 mph (144.84 km/h) | 86.2 mph (138.72 km/h) |
| 95 mph (152.89 km/h) | 90.98 mph (146.42 km/h) |
| 100 mph (160.93 km/h) | 95.77 mph (154.13 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1887 | 2192 | 2360 | 2465 | 2577 | 2657 | 2746 | 2850 | 2994 | 3139 | 3300 | 3428 | 3661 | 3918 | 4118 | 4247 | 4319 | 4584 | 4953 | 5756 |
Better Fuel Economy Factory Ratios Increased Power
