Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-20 | 305/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.73 (679) | 28.41 (721.5) | 1.67 (42.5) 6.3% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 83.98 (2133.14) | 89.24 (2266.66) | 5.26 (133.52) 6.3% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 4.2 (106.75) | 0.84 (21.25) 24.9% |
| Revolutions per mile (km) | 754.45 (468.79) | 710.01 (441.18) | -44.44 (-27.61) -5.9% |
305/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.25 mph (34.2 km/h) |
| 25 mph (40.23 km/h) | 26.56 mph (42.75 km/h) |
| 30 mph (48.28 km/h) | 31.88 mph (51.3 km/h) |
| 35 mph (56.33 km/h) | 37.19 mph (59.85 km/h) |
| 40 mph (64.37 km/h) | 42.5 mph (68.4 km/h) |
| 45 mph (72.42 km/h) | 47.82 mph (76.95 km/h) |
| 50 mph (80.47 km/h) | 53.13 mph (85.5 km/h) |
| 55 mph (88.51 km/h) | 58.44 mph (94.05 km/h) |
| 60 mph (96.56 km/h) | 63.76 mph (102.6 km/h) |
| 65 mph (104.61 km/h) | 69.07 mph (111.16 km/h) |
| 70 mph (112.65 km/h) | 74.38 mph (119.71 km/h) |
| 75 mph (120.7 km/h) | 79.69 mph (128.26 km/h) |
| 80 mph (128.75 km/h) | 85.01 mph (136.81 km/h) |
| 85 mph (136.79 km/h) | 90.32 mph (145.36 km/h) |
| 90 mph (144.84 km/h) | 95.63 mph (153.91 km/h) |
| 95 mph (152.89 km/h) | 100.95 mph (162.46 km/h) |
| 100 mph (160.93 km/h) | 106.26 mph (171.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1807 | 2099 | 2260 | 2360 | 2468 | 2545 | 2630 | 2729 | 2868 | 3006 | 3160 | 3283 | 3506 | 3752 | 3944 | 4067 | 4136 | 4390 | 4744 | 5513 |
Better Fuel Economy Factory Ratios Increased Power
