Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 355/20-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 26.59 (675.4) | -1.4 (-35.5) -5% |
| Width inches (mm) | 13.98 (355) | 13.98 (355) | 0 (0) 0% |
| Circum. inches (mm) | 87.93 (2233.36) | 83.54 (2121.83) | -4.39 (-111.53) -5% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 2.8 (71) | -0.7 (-17.75) -20% |
| Revolutions per mile (km) | 720.59 (447.76) | 758.47 (471.29) | 37.88 (23.53) 5.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19 mph (30.58 km/h) |
| 25 mph (40.23 km/h) | 23.75 mph (38.22 km/h) |
| 30 mph (48.28 km/h) | 28.5 mph (45.87 km/h) |
| 35 mph (56.33 km/h) | 33.25 mph (53.51 km/h) |
| 40 mph (64.37 km/h) | 38 mph (61.16 km/h) |
| 45 mph (72.42 km/h) | 42.75 mph (68.8 km/h) |
| 50 mph (80.47 km/h) | 47.5 mph (76.45 km/h) |
| 55 mph (88.51 km/h) | 52.25 mph (84.09 km/h) |
| 60 mph (96.56 km/h) | 57 mph (91.74 km/h) |
| 65 mph (104.61 km/h) | 61.75 mph (99.38 km/h) |
| 70 mph (112.65 km/h) | 66.5 mph (107.03 km/h) |
| 75 mph (120.7 km/h) | 71.25 mph (114.67 km/h) |
| 80 mph (128.75 km/h) | 76.01 mph (122.32 km/h) |
| 85 mph (136.79 km/h) | 80.76 mph (129.96 km/h) |
| 90 mph (144.84 km/h) | 85.51 mph (137.61 km/h) |
| 95 mph (152.89 km/h) | 90.26 mph (145.25 km/h) |
| 100 mph (160.93 km/h) | 95.01 mph (152.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1930 | 2242 | 2415 | 2522 | 2637 | 2719 | 2809 | 2916 | 3064 | 3211 | 3376 | 3507 | 3745 | 4008 | 4213 | 4345 | 4419 | 4690 | 5068 | 5889 |
Better Fuel Economy Factory Ratios Increased Power
