Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 345/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 29.15 (740.4) | 1.89 (48) 6.9% |
| Width inches (mm) | 10.43 (265) | 13.58 (345) | 3.15 (80) 30.2% |
| Circum. inches (mm) | 85.64 (2175.24) | 91.58 (2326.04) | 5.94 (150.8) 6.9% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 4.07 (103.5) | 0.94 (24) 30.2% |
| Revolutions per mile (km) | 739.85 (459.72) | 691.88 (429.92) | -47.96 (-29.8) -6.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.39 mph (34.42 km/h) |
| 25 mph (40.23 km/h) | 26.73 mph (43.02 km/h) |
| 30 mph (48.28 km/h) | 32.08 mph (51.63 km/h) |
| 35 mph (56.33 km/h) | 37.43 mph (60.23 km/h) |
| 40 mph (64.37 km/h) | 42.77 mph (68.84 km/h) |
| 45 mph (72.42 km/h) | 48.12 mph (77.44 km/h) |
| 50 mph (80.47 km/h) | 53.47 mph (86.05 km/h) |
| 55 mph (88.51 km/h) | 58.81 mph (94.65 km/h) |
| 60 mph (96.56 km/h) | 64.16 mph (103.25 km/h) |
| 65 mph (104.61 km/h) | 69.51 mph (111.86 km/h) |
| 70 mph (112.65 km/h) | 74.85 mph (120.46 km/h) |
| 75 mph (120.7 km/h) | 80.2 mph (129.07 km/h) |
| 80 mph (128.75 km/h) | 85.55 mph (137.67 km/h) |
| 85 mph (136.79 km/h) | 90.89 mph (146.28 km/h) |
| 90 mph (144.84 km/h) | 96.24 mph (154.88 km/h) |
| 95 mph (152.89 km/h) | 101.59 mph (163.49 km/h) |
| 100 mph (160.93 km/h) | 106.93 mph (172.09 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1761 | 2045 | 2203 | 2300 | 2405 | 2480 | 2562 | 2660 | 2795 | 2930 | 3079 | 3199 | 3417 | 3656 | 3844 | 3963 | 4031 | 4278 | 4623 | 5372 |
Better Fuel Economy Factory Ratios Increased Power
