Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 305/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 28.2 (716.4) | 0.22 (5.5) 0.8% |
| Width inches (mm) | 13.98 (355) | 12.01 (305) | -1.97 (-50) -14.1% |
| Circum. inches (mm) | 87.93 (2233.36) | 88.61 (2250.64) | 0.68 (17.28) 0.8% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 3.6 (91.5) | 0.11 (2.75) 3.1% |
| Revolutions per mile (km) | 720.59 (447.76) | 715.06 (444.32) | -5.53 (-3.44) -0.8% |
305/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.15 mph (32.44 km/h) |
| 25 mph (40.23 km/h) | 25.19 mph (40.54 km/h) |
| 30 mph (48.28 km/h) | 30.23 mph (48.65 km/h) |
| 35 mph (56.33 km/h) | 35.27 mph (56.76 km/h) |
| 40 mph (64.37 km/h) | 40.31 mph (64.87 km/h) |
| 45 mph (72.42 km/h) | 45.35 mph (72.98 km/h) |
| 50 mph (80.47 km/h) | 50.39 mph (81.09 km/h) |
| 55 mph (88.51 km/h) | 55.43 mph (89.2 km/h) |
| 60 mph (96.56 km/h) | 60.46 mph (97.31 km/h) |
| 65 mph (104.61 km/h) | 65.5 mph (105.42 km/h) |
| 70 mph (112.65 km/h) | 70.54 mph (113.53 km/h) |
| 75 mph (120.7 km/h) | 75.58 mph (121.63 km/h) |
| 80 mph (128.75 km/h) | 80.62 mph (129.74 km/h) |
| 85 mph (136.79 km/h) | 85.66 mph (137.85 km/h) |
| 90 mph (144.84 km/h) | 90.7 mph (145.96 km/h) |
| 95 mph (152.89 km/h) | 95.73 mph (154.07 km/h) |
| 100 mph (160.93 km/h) | 100.77 mph (162.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1820 | 2114 | 2277 | 2377 | 2486 | 2563 | 2648 | 2749 | 2888 | 3028 | 3183 | 3306 | 3531 | 3779 | 3972 | 4096 | 4166 | 4421 | 4778 | 5552 |
Better Fuel Economy Factory Ratios Increased Power
