Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 405/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 27.57 (700.2) | -0.42 (-10.7) -1.5% |
| Width inches (mm) | 13.98 (355) | 15.94 (405) | 1.97 (50) 14.1% |
| Circum. inches (mm) | 87.93 (2233.36) | 86.6 (2199.74) | -1.32 (-33.62) -1.5% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 4.78 (121.5) | 1.29 (32.75) 36.9% |
| Revolutions per mile (km) | 720.59 (447.76) | 731.61 (454.6) | 11.01 (6.84) 1.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.7 mph (31.7 km/h) |
| 25 mph (40.23 km/h) | 24.62 mph (39.63 km/h) |
| 30 mph (48.28 km/h) | 29.55 mph (47.55 km/h) |
| 35 mph (56.33 km/h) | 34.47 mph (55.48 km/h) |
| 40 mph (64.37 km/h) | 39.4 mph (63.4 km/h) |
| 45 mph (72.42 km/h) | 44.32 mph (71.33 km/h) |
| 50 mph (80.47 km/h) | 49.25 mph (79.26 km/h) |
| 55 mph (88.51 km/h) | 54.17 mph (87.18 km/h) |
| 60 mph (96.56 km/h) | 59.1 mph (95.11 km/h) |
| 65 mph (104.61 km/h) | 64.02 mph (103.03 km/h) |
| 70 mph (112.65 km/h) | 68.95 mph (110.96 km/h) |
| 75 mph (120.7 km/h) | 73.87 mph (118.88 km/h) |
| 80 mph (128.75 km/h) | 78.8 mph (126.81 km/h) |
| 85 mph (136.79 km/h) | 83.72 mph (134.74 km/h) |
| 90 mph (144.84 km/h) | 88.65 mph (142.66 km/h) |
| 95 mph (152.89 km/h) | 93.57 mph (150.59 km/h) |
| 100 mph (160.93 km/h) | 98.49 mph (158.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1862 | 2163 | 2329 | 2432 | 2543 | 2622 | 2710 | 2813 | 2955 | 3098 | 3256 | 3383 | 3613 | 3866 | 4064 | 4191 | 4262 | 4524 | 4888 | 5680 |
Better Fuel Economy Factory Ratios Increased Power
