Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/25-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26 (660.5) | 27.2 (691) | 1.2 (30.5) 4.6% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 81.69 (2075.02) | 85.47 (2170.84) | 3.77 (95.82) 4.6% |
| Sidewall Height inches (mm) | 3 (76.25) | 3.6 (91.5) | 0.6 (15.25) 20% |
| Revolutions per mile (km) | 775.58 (481.92) | 741.35 (460.65) | -34.23 (-21.27) -4.4% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.92 mph (33.67 km/h) |
| 25 mph (40.23 km/h) | 26.15 mph (42.09 km/h) |
| 30 mph (48.28 km/h) | 31.39 mph (50.51 km/h) |
| 35 mph (56.33 km/h) | 36.62 mph (58.93 km/h) |
| 40 mph (64.37 km/h) | 41.85 mph (67.35 km/h) |
| 45 mph (72.42 km/h) | 47.08 mph (75.76 km/h) |
| 50 mph (80.47 km/h) | 52.31 mph (84.18 km/h) |
| 55 mph (88.51 km/h) | 57.54 mph (92.6 km/h) |
| 60 mph (96.56 km/h) | 62.77 mph (101.02 km/h) |
| 65 mph (104.61 km/h) | 68 mph (109.44 km/h) |
| 70 mph (112.65 km/h) | 73.23 mph (117.86 km/h) |
| 75 mph (120.7 km/h) | 78.46 mph (126.27 km/h) |
| 80 mph (128.75 km/h) | 83.69 mph (134.69 km/h) |
| 85 mph (136.79 km/h) | 88.93 mph (143.11 km/h) |
| 90 mph (144.84 km/h) | 94.16 mph (151.53 km/h) |
| 95 mph (152.89 km/h) | 99.39 mph (159.95 km/h) |
| 100 mph (160.93 km/h) | 104.62 mph (168.37 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
