Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-21 | 305/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.41 (670.9) | 27 (685.9) | 0.59 (15) 2.2% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 82.98 (2107.69) | 84.84 (2154.82) | 1.86 (47.12) 2.2% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 3 (76.25) | 0.3 (7.5) 10.9% |
| Revolutions per mile (km) | 763.56 (474.45) | 746.86 (464.08) | -16.7 (-10.38) -2.2% |
305/25-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.45 mph (32.91 km/h) |
| 25 mph (40.23 km/h) | 25.56 mph (41.13 km/h) |
| 30 mph (48.28 km/h) | 30.67 mph (49.36 km/h) |
| 35 mph (56.33 km/h) | 35.78 mph (57.59 km/h) |
| 40 mph (64.37 km/h) | 40.89 mph (65.81 km/h) |
| 45 mph (72.42 km/h) | 46.01 mph (74.04 km/h) |
| 50 mph (80.47 km/h) | 51.12 mph (82.27 km/h) |
| 55 mph (88.51 km/h) | 56.23 mph (90.49 km/h) |
| 60 mph (96.56 km/h) | 61.34 mph (98.72 km/h) |
| 65 mph (104.61 km/h) | 66.45 mph (106.95 km/h) |
| 70 mph (112.65 km/h) | 71.57 mph (115.17 km/h) |
| 75 mph (120.7 km/h) | 76.68 mph (123.4 km/h) |
| 80 mph (128.75 km/h) | 81.79 mph (131.63 km/h) |
| 85 mph (136.79 km/h) | 86.9 mph (139.85 km/h) |
| 90 mph (144.84 km/h) | 92.01 mph (148.08 km/h) |
| 95 mph (152.89 km/h) | 97.12 mph (156.31 km/h) |
| 100 mph (160.93 km/h) | 102.24 mph (164.53 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 |
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