Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.79 (655) | 27.2 (691) | 1.42 (36) 5.5% |
| Width inches (mm) | 9.65 (245) | 12.01 (305) | 2.36 (60) 24.5% |
| Circum. inches (mm) | 81.01 (2057.74) | 85.47 (2170.84) | 4.45 (113.1) 5.5% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 3.6 (91.5) | 0.71 (18) 24.5% |
| Revolutions per mile (km) | 782.09 (485.97) | 741.35 (460.65) | -40.75 (-25.32) -5.2% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.1 mph (33.96 km/h) |
| 25 mph (40.23 km/h) | 26.37 mph (42.44 km/h) |
| 30 mph (48.28 km/h) | 31.65 mph (50.93 km/h) |
| 35 mph (56.33 km/h) | 36.92 mph (59.42 km/h) |
| 40 mph (64.37 km/h) | 42.2 mph (67.91 km/h) |
| 45 mph (72.42 km/h) | 47.47 mph (76.4 km/h) |
| 50 mph (80.47 km/h) | 52.75 mph (84.89 km/h) |
| 55 mph (88.51 km/h) | 58.02 mph (93.38 km/h) |
| 60 mph (96.56 km/h) | 63.3 mph (101.87 km/h) |
| 65 mph (104.61 km/h) | 68.57 mph (110.36 km/h) |
| 70 mph (112.65 km/h) | 73.85 mph (118.85 km/h) |
| 75 mph (120.7 km/h) | 79.12 mph (127.33 km/h) |
| 80 mph (128.75 km/h) | 84.4 mph (135.82 km/h) |
| 85 mph (136.79 km/h) | 89.67 mph (144.31 km/h) |
| 90 mph (144.84 km/h) | 94.95 mph (152.8 km/h) |
| 95 mph (152.89 km/h) | 100.22 mph (161.29 km/h) |
| 100 mph (160.93 km/h) | 105.5 mph (169.78 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
