Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-20 | 305/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.44 (697) | 28.41 (721.5) | 0.96 (24.5) 3.5% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 86.21 (2189.69) | 89.24 (2266.66) | 3.03 (76.97) 3.5% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 4.2 (106.75) | 0.48 (12.25) 13% |
| Revolutions per mile (km) | 734.96 (456.68) | 710.01 (441.18) | -24.96 (-15.51) -3.4% |
305/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.7 mph (33.32 km/h) |
| 25 mph (40.23 km/h) | 25.88 mph (41.65 km/h) |
| 30 mph (48.28 km/h) | 31.05 mph (49.98 km/h) |
| 35 mph (56.33 km/h) | 36.23 mph (58.31 km/h) |
| 40 mph (64.37 km/h) | 41.41 mph (66.64 km/h) |
| 45 mph (72.42 km/h) | 46.58 mph (74.97 km/h) |
| 50 mph (80.47 km/h) | 51.76 mph (83.3 km/h) |
| 55 mph (88.51 km/h) | 56.93 mph (91.63 km/h) |
| 60 mph (96.56 km/h) | 62.11 mph (99.96 km/h) |
| 65 mph (104.61 km/h) | 67.28 mph (108.28 km/h) |
| 70 mph (112.65 km/h) | 72.46 mph (116.61 km/h) |
| 75 mph (120.7 km/h) | 77.64 mph (124.94 km/h) |
| 80 mph (128.75 km/h) | 82.81 mph (133.27 km/h) |
| 85 mph (136.79 km/h) | 87.99 mph (141.6 km/h) |
| 90 mph (144.84 km/h) | 93.16 mph (149.93 km/h) |
| 95 mph (152.89 km/h) | 98.34 mph (158.26 km/h) |
| 100 mph (160.93 km/h) | 103.52 mph (166.59 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
