Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 365/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 29.62 (752.4) | 2.36 (60) 8.7% |
| Width inches (mm) | 10.43 (265) | 14.37 (365) | 3.94 (100) 37.7% |
| Circum. inches (mm) | 85.64 (2175.24) | 93.06 (2363.73) | 7.42 (188.5) 8.7% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 4.31 (109.5) | 1.18 (30) 37.7% |
| Revolutions per mile (km) | 739.85 (459.72) | 680.85 (423.06) | -59 (-36.66) -8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.73 mph (34.98 km/h) |
| 25 mph (40.23 km/h) | 27.17 mph (43.72 km/h) |
| 30 mph (48.28 km/h) | 32.6 mph (52.46 km/h) |
| 35 mph (56.33 km/h) | 38.03 mph (61.21 km/h) |
| 40 mph (64.37 km/h) | 43.47 mph (69.95 km/h) |
| 45 mph (72.42 km/h) | 48.9 mph (78.7 km/h) |
| 50 mph (80.47 km/h) | 54.33 mph (87.44 km/h) |
| 55 mph (88.51 km/h) | 59.77 mph (96.18 km/h) |
| 60 mph (96.56 km/h) | 65.2 mph (104.93 km/h) |
| 65 mph (104.61 km/h) | 70.63 mph (113.67 km/h) |
| 70 mph (112.65 km/h) | 76.07 mph (122.42 km/h) |
| 75 mph (120.7 km/h) | 81.5 mph (131.16 km/h) |
| 80 mph (128.75 km/h) | 86.93 mph (139.9 km/h) |
| 85 mph (136.79 km/h) | 92.37 mph (148.65 km/h) |
| 90 mph (144.84 km/h) | 97.8 mph (157.39 km/h) |
| 95 mph (152.89 km/h) | 103.23 mph (166.14 km/h) |
| 100 mph (160.93 km/h) | 108.67 mph (174.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1733 | 2013 | 2168 | 2263 | 2367 | 2440 | 2522 | 2617 | 2750 | 2883 | 3030 | 3148 | 3362 | 3598 | 3782 | 3900 | 3967 | 4210 | 4549 | 5286 |
Better Fuel Economy Factory Ratios Increased Power
