Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 315/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 28.44 (722.4) | 0.45 (11.5) 1.6% |
| Width inches (mm) | 13.98 (355) | 12.4 (315) | -1.57 (-40) -11.3% |
| Circum. inches (mm) | 87.93 (2233.36) | 89.35 (2269.49) | 1.42 (36.13) 1.6% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 3.72 (94.5) | 0.23 (5.75) 6.5% |
| Revolutions per mile (km) | 720.59 (447.76) | 709.12 (440.63) | -11.47 (-7.13) -1.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.32 mph (32.71 km/h) |
| 25 mph (40.23 km/h) | 25.4 mph (40.88 km/h) |
| 30 mph (48.28 km/h) | 30.49 mph (49.06 km/h) |
| 35 mph (56.33 km/h) | 35.57 mph (57.24 km/h) |
| 40 mph (64.37 km/h) | 40.65 mph (65.42 km/h) |
| 45 mph (72.42 km/h) | 45.73 mph (73.59 km/h) |
| 50 mph (80.47 km/h) | 50.81 mph (81.77 km/h) |
| 55 mph (88.51 km/h) | 55.89 mph (89.95 km/h) |
| 60 mph (96.56 km/h) | 60.97 mph (98.12 km/h) |
| 65 mph (104.61 km/h) | 66.05 mph (106.3 km/h) |
| 70 mph (112.65 km/h) | 71.13 mph (114.48 km/h) |
| 75 mph (120.7 km/h) | 76.21 mph (122.65 km/h) |
| 80 mph (128.75 km/h) | 81.29 mph (130.83 km/h) |
| 85 mph (136.79 km/h) | 86.38 mph (139.01 km/h) |
| 90 mph (144.84 km/h) | 91.46 mph (147.18 km/h) |
| 95 mph (152.89 km/h) | 96.54 mph (155.36 km/h) |
| 100 mph (160.93 km/h) | 101.62 mph (163.54 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1805 | 2096 | 2258 | 2357 | 2465 | 2542 | 2626 | 2726 | 2864 | 3003 | 3156 | 3279 | 3502 | 3747 | 3939 | 4062 | 4131 | 4385 | 4738 | 5506 |
Better Fuel Economy Factory Ratios Increased Power
