Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/35-21 | 305/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.58 (725.9) | 28.2 (716.4) | -0.37 (-9.5) -1.3% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 89.78 (2280.48) | 88.61 (2250.64) | -1.18 (-29.85) -1.3% |
| Sidewall Height inches (mm) | 3.79 (96.25) | 3.6 (91.5) | -0.19 (-4.75) -4.9% |
| Revolutions per mile (km) | 705.7 (438.5) | 715.06 (444.32) | 9.36 (5.81) 1.3% |
305/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.74 mph (31.77 km/h) |
| 25 mph (40.23 km/h) | 24.67 mph (39.71 km/h) |
| 30 mph (48.28 km/h) | 29.61 mph (47.65 km/h) |
| 35 mph (56.33 km/h) | 34.54 mph (55.59 km/h) |
| 40 mph (64.37 km/h) | 39.48 mph (63.53 km/h) |
| 45 mph (72.42 km/h) | 44.41 mph (71.47 km/h) |
| 50 mph (80.47 km/h) | 49.35 mph (79.41 km/h) |
| 55 mph (88.51 km/h) | 54.28 mph (87.36 km/h) |
| 60 mph (96.56 km/h) | 59.21 mph (95.3 km/h) |
| 65 mph (104.61 km/h) | 64.15 mph (103.24 km/h) |
| 70 mph (112.65 km/h) | 69.08 mph (111.18 km/h) |
| 75 mph (120.7 km/h) | 74.02 mph (119.12 km/h) |
| 80 mph (128.75 km/h) | 78.95 mph (127.06 km/h) |
| 85 mph (136.79 km/h) | 83.89 mph (135 km/h) |
| 90 mph (144.84 km/h) | 88.82 mph (142.95 km/h) |
| 95 mph (152.89 km/h) | 93.76 mph (150.89 km/h) |
| 100 mph (160.93 km/h) | 98.69 mph (158.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1820 | 2114 | 2277 | 2377 | 2486 | 2563 | 2648 | 2749 | 2888 | 3028 | 3183 | 3306 | 3531 | 3779 | 3972 | 4096 | 4166 | 4421 | 4778 | 5552 |
Better Fuel Economy Factory Ratios Increased Power
