Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 385/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 31.61 (802.9) | 4.35 (110.5) 16% |
| Width inches (mm) | 10.43 (265) | 15.16 (385) | 4.72 (120) 45.3% |
| Circum. inches (mm) | 85.64 (2175.24) | 99.31 (2522.38) | 13.67 (347.15) 16% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 5.31 (134.75) | 2.18 (55.25) 69.5% |
| Revolutions per mile (km) | 739.85 (459.72) | 638.02 (396.45) | -101.82 (-63.27) -13.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.19 mph (37.32 km/h) |
| 25 mph (40.23 km/h) | 28.99 mph (46.65 km/h) |
| 30 mph (48.28 km/h) | 34.79 mph (55.99 km/h) |
| 35 mph (56.33 km/h) | 40.59 mph (65.32 km/h) |
| 40 mph (64.37 km/h) | 46.38 mph (74.65 km/h) |
| 45 mph (72.42 km/h) | 52.18 mph (83.98 km/h) |
| 50 mph (80.47 km/h) | 57.98 mph (93.31 km/h) |
| 55 mph (88.51 km/h) | 63.78 mph (102.64 km/h) |
| 60 mph (96.56 km/h) | 69.58 mph (111.97 km/h) |
| 65 mph (104.61 km/h) | 75.37 mph (121.3 km/h) |
| 70 mph (112.65 km/h) | 81.17 mph (130.63 km/h) |
| 75 mph (120.7 km/h) | 86.97 mph (139.96 km/h) |
| 80 mph (128.75 km/h) | 92.77 mph (149.29 km/h) |
| 85 mph (136.79 km/h) | 98.57 mph (158.63 km/h) |
| 90 mph (144.84 km/h) | 104.36 mph (167.96 km/h) |
| 95 mph (152.89 km/h) | 110.16 mph (177.29 km/h) |
| 100 mph (160.93 km/h) | 115.96 mph (186.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1624 | 1886 | 2031 | 2121 | 2218 | 2287 | 2363 | 2453 | 2577 | 2701 | 2840 | 2950 | 3151 | 3372 | 3544 | 3655 | 3717 | 3945 | 4263 | 4954 |
Better Fuel Economy Factory Ratios Increased Power
