Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 345/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 29.15 (740.4) | 1.16 (29.5) 4.1% |
| Width inches (mm) | 13.98 (355) | 13.58 (345) | -0.39 (-10) -2.8% |
| Circum. inches (mm) | 87.93 (2233.36) | 91.58 (2326.04) | 3.65 (92.68) 4.1% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 4.07 (103.5) | 0.58 (14.75) 16.6% |
| Revolutions per mile (km) | 720.59 (447.76) | 691.88 (429.92) | -28.71 (-17.84) -4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.83 mph (33.52 km/h) |
| 25 mph (40.23 km/h) | 26.04 mph (41.9 km/h) |
| 30 mph (48.28 km/h) | 31.24 mph (50.28 km/h) |
| 35 mph (56.33 km/h) | 36.45 mph (58.66 km/h) |
| 40 mph (64.37 km/h) | 41.66 mph (67.05 km/h) |
| 45 mph (72.42 km/h) | 46.87 mph (75.43 km/h) |
| 50 mph (80.47 km/h) | 52.07 mph (83.81 km/h) |
| 55 mph (88.51 km/h) | 57.28 mph (92.19 km/h) |
| 60 mph (96.56 km/h) | 62.49 mph (100.57 km/h) |
| 65 mph (104.61 km/h) | 67.7 mph (108.95 km/h) |
| 70 mph (112.65 km/h) | 72.9 mph (117.33 km/h) |
| 75 mph (120.7 km/h) | 78.11 mph (125.71 km/h) |
| 80 mph (128.75 km/h) | 83.32 mph (134.09 km/h) |
| 85 mph (136.79 km/h) | 88.53 mph (142.47 km/h) |
| 90 mph (144.84 km/h) | 93.73 mph (150.85 km/h) |
| 95 mph (152.89 km/h) | 98.94 mph (159.23 km/h) |
| 100 mph (160.93 km/h) | 104.15 mph (167.61 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
