Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 355/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 29.39 (746.4) | 1.4 (35.5) 5% |
| Width inches (mm) | 13.98 (355) | 13.98 (355) | 0 (0) 0% |
| Circum. inches (mm) | 87.93 (2233.36) | 92.32 (2344.88) | 4.39 (111.53) 5% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 4.19 (106.5) | 0.7 (17.75) 20% |
| Revolutions per mile (km) | 720.59 (447.76) | 686.32 (426.46) | -34.27 (-21.3) -4.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21 mph (33.79 km/h) |
| 25 mph (40.23 km/h) | 26.25 mph (42.24 km/h) |
| 30 mph (48.28 km/h) | 31.5 mph (50.69 km/h) |
| 35 mph (56.33 km/h) | 36.75 mph (59.14 km/h) |
| 40 mph (64.37 km/h) | 42 mph (67.59 km/h) |
| 45 mph (72.42 km/h) | 47.25 mph (76.04 km/h) |
| 50 mph (80.47 km/h) | 52.5 mph (84.49 km/h) |
| 55 mph (88.51 km/h) | 57.75 mph (92.93 km/h) |
| 60 mph (96.56 km/h) | 63 mph (101.38 km/h) |
| 65 mph (104.61 km/h) | 68.25 mph (109.83 km/h) |
| 70 mph (112.65 km/h) | 73.5 mph (118.28 km/h) |
| 75 mph (120.7 km/h) | 78.75 mph (126.73 km/h) |
| 80 mph (128.75 km/h) | 83.99 mph (135.18 km/h) |
| 85 mph (136.79 km/h) | 89.24 mph (143.63 km/h) |
| 90 mph (144.84 km/h) | 94.49 mph (152.07 km/h) |
| 95 mph (152.89 km/h) | 99.74 mph (160.52 km/h) |
| 100 mph (160.93 km/h) | 104.99 mph (168.97 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1747 | 2029 | 2185 | 2282 | 2386 | 2460 | 2542 | 2638 | 2772 | 2906 | 3055 | 3174 | 3389 | 3627 | 3813 | 3932 | 3998 | 4244 | 4586 | 5329 |
Better Fuel Economy Factory Ratios Increased Power
