Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/30-21 | 305/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.4) | 27 (685.9) | -0.96 (-24.5) -3.4% |
| Width inches (mm) | 11.61 (295) | 12.01 (305) | 0.39 (10) 3.4% |
| Circum. inches (mm) | 87.87 (2231.79) | 84.84 (2154.82) | -3.03 (-76.97) -3.4% |
| Sidewall Height inches (mm) | 3.48 (88.5) | 3 (76.25) | -0.48 (-12.25) -13.8% |
| Revolutions per mile (km) | 721.1 (448.07) | 746.86 (464.08) | 25.76 (16) 3.6% |
305/25-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.31 mph (31.08 km/h) |
| 25 mph (40.23 km/h) | 24.14 mph (38.85 km/h) |
| 30 mph (48.28 km/h) | 28.97 mph (46.62 km/h) |
| 35 mph (56.33 km/h) | 33.79 mph (54.38 km/h) |
| 40 mph (64.37 km/h) | 38.62 mph (62.15 km/h) |
| 45 mph (72.42 km/h) | 43.45 mph (69.92 km/h) |
| 50 mph (80.47 km/h) | 48.28 mph (77.69 km/h) |
| 55 mph (88.51 km/h) | 53.1 mph (85.46 km/h) |
| 60 mph (96.56 km/h) | 57.93 mph (93.23 km/h) |
| 65 mph (104.61 km/h) | 62.76 mph (101 km/h) |
| 70 mph (112.65 km/h) | 67.59 mph (108.77 km/h) |
| 75 mph (120.7 km/h) | 72.41 mph (116.54 km/h) |
| 80 mph (128.75 km/h) | 77.24 mph (124.31 km/h) |
| 85 mph (136.79 km/h) | 82.07 mph (132.08 km/h) |
| 90 mph (144.84 km/h) | 86.9 mph (139.85 km/h) |
| 95 mph (152.89 km/h) | 91.72 mph (147.62 km/h) |
| 100 mph (160.93 km/h) | 96.55 mph (155.38 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
