Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/35-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.85 (707.5) | 27.2 (691) | -0.65 (-16.5) -2.3% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 87.51 (2222.68) | 85.47 (2170.84) | -2.04 (-51.84) -2.3% |
| Sidewall Height inches (mm) | 3.93 (99.75) | 3.6 (91.5) | -0.32 (-8.25) -8.3% |
| Revolutions per mile (km) | 724.06 (449.91) | 741.35 (460.65) | 17.29 (10.74) 2.4% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.53 mph (31.44 km/h) |
| 25 mph (40.23 km/h) | 24.42 mph (39.3 km/h) |
| 30 mph (48.28 km/h) | 29.3 mph (47.15 km/h) |
| 35 mph (56.33 km/h) | 34.18 mph (55.01 km/h) |
| 40 mph (64.37 km/h) | 39.07 mph (62.87 km/h) |
| 45 mph (72.42 km/h) | 43.95 mph (70.73 km/h) |
| 50 mph (80.47 km/h) | 48.83 mph (78.59 km/h) |
| 55 mph (88.51 km/h) | 53.72 mph (86.45 km/h) |
| 60 mph (96.56 km/h) | 58.6 mph (94.31 km/h) |
| 65 mph (104.61 km/h) | 63.48 mph (102.17 km/h) |
| 70 mph (112.65 km/h) | 68.37 mph (110.03 km/h) |
| 75 mph (120.7 km/h) | 73.25 mph (117.89 km/h) |
| 80 mph (128.75 km/h) | 78.13 mph (125.75 km/h) |
| 85 mph (136.79 km/h) | 83.02 mph (133.6 km/h) |
| 90 mph (144.84 km/h) | 87.9 mph (141.46 km/h) |
| 95 mph (152.89 km/h) | 92.78 mph (149.32 km/h) |
| 100 mph (160.93 km/h) | 97.67 mph (157.18 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
