Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673) | 27.2 (691) | 0.71 (18) 2.7% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 83.24 (2114.29) | 85.47 (2170.84) | 2.23 (56.55) 2.7% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 3.6 (91.5) | 0.35 (9) 10.9% |
| Revolutions per mile (km) | 761.17 (472.97) | 741.35 (460.65) | -19.83 (-12.32) -2.6% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.53 mph (33.05 km/h) |
| 25 mph (40.23 km/h) | 25.67 mph (41.31 km/h) |
| 30 mph (48.28 km/h) | 30.8 mph (49.57 km/h) |
| 35 mph (56.33 km/h) | 35.94 mph (57.83 km/h) |
| 40 mph (64.37 km/h) | 41.07 mph (66.1 km/h) |
| 45 mph (72.42 km/h) | 46.2 mph (74.36 km/h) |
| 50 mph (80.47 km/h) | 51.34 mph (82.62 km/h) |
| 55 mph (88.51 km/h) | 56.47 mph (90.88 km/h) |
| 60 mph (96.56 km/h) | 61.6 mph (99.14 km/h) |
| 65 mph (104.61 km/h) | 66.74 mph (107.41 km/h) |
| 70 mph (112.65 km/h) | 71.87 mph (115.67 km/h) |
| 75 mph (120.7 km/h) | 77.01 mph (123.93 km/h) |
| 80 mph (128.75 km/h) | 82.14 mph (132.19 km/h) |
| 85 mph (136.79 km/h) | 87.27 mph (140.45 km/h) |
| 90 mph (144.84 km/h) | 92.41 mph (148.72 km/h) |
| 95 mph (152.89 km/h) | 97.54 mph (156.98 km/h) |
| 100 mph (160.93 km/h) | 102.67 mph (165.24 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
