Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 305/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 27 (685.9) | -0.98 (-25) -3.5% |
| Width inches (mm) | 13.98 (355) | 12.01 (305) | -1.97 (-50) -14.1% |
| Circum. inches (mm) | 87.93 (2233.36) | 84.84 (2154.82) | -3.09 (-78.54) -3.5% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 3 (76.25) | -0.49 (-12.5) -14.1% |
| Revolutions per mile (km) | 720.59 (447.76) | 746.86 (464.08) | 26.26 (16.32) 3.6% |
305/25-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.3 mph (31.06 km/h) |
| 25 mph (40.23 km/h) | 24.12 mph (38.82 km/h) |
| 30 mph (48.28 km/h) | 28.94 mph (46.58 km/h) |
| 35 mph (56.33 km/h) | 33.77 mph (54.35 km/h) |
| 40 mph (64.37 km/h) | 38.59 mph (62.11 km/h) |
| 45 mph (72.42 km/h) | 43.42 mph (69.87 km/h) |
| 50 mph (80.47 km/h) | 48.24 mph (77.64 km/h) |
| 55 mph (88.51 km/h) | 53.07 mph (85.4 km/h) |
| 60 mph (96.56 km/h) | 57.89 mph (93.17 km/h) |
| 65 mph (104.61 km/h) | 62.71 mph (100.93 km/h) |
| 70 mph (112.65 km/h) | 67.54 mph (108.69 km/h) |
| 75 mph (120.7 km/h) | 72.36 mph (116.46 km/h) |
| 80 mph (128.75 km/h) | 77.19 mph (124.22 km/h) |
| 85 mph (136.79 km/h) | 82.01 mph (131.98 km/h) |
| 90 mph (144.84 km/h) | 86.83 mph (139.75 km/h) |
| 95 mph (152.89 km/h) | 91.66 mph (147.51 km/h) |
| 100 mph (160.93 km/h) | 96.48 mph (155.28 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1901 | 2208 | 2378 | 2483 | 2596 | 2677 | 2766 | 2871 | 3017 | 3162 | 3324 | 3453 | 3688 | 3947 | 4149 | 4278 | 4351 | 4618 | 4990 | 5799 |
Better Fuel Economy Factory Ratios Increased Power
