Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/35-21 | 315/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.58 (725.9) | 28.44 (722.4) | -0.14 (-3.5) -0.5% |
| Width inches (mm) | 10.83 (275) | 12.4 (315) | 1.57 (40) 14.5% |
| Circum. inches (mm) | 89.78 (2280.48) | 89.35 (2269.49) | -0.43 (-11) -0.5% |
| Sidewall Height inches (mm) | 3.79 (96.25) | 3.72 (94.5) | -0.07 (-1.75) -1.8% |
| Revolutions per mile (km) | 705.7 (438.5) | 709.12 (440.63) | 3.42 (2.12) 0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.9 mph (32.03 km/h) |
| 25 mph (40.23 km/h) | 24.88 mph (40.04 km/h) |
| 30 mph (48.28 km/h) | 29.86 mph (48.05 km/h) |
| 35 mph (56.33 km/h) | 34.83 mph (56.06 km/h) |
| 40 mph (64.37 km/h) | 39.81 mph (64.06 km/h) |
| 45 mph (72.42 km/h) | 44.78 mph (72.07 km/h) |
| 50 mph (80.47 km/h) | 49.76 mph (80.08 km/h) |
| 55 mph (88.51 km/h) | 54.73 mph (88.09 km/h) |
| 60 mph (96.56 km/h) | 59.71 mph (96.1 km/h) |
| 65 mph (104.61 km/h) | 64.69 mph (104.1 km/h) |
| 70 mph (112.65 km/h) | 69.66 mph (112.11 km/h) |
| 75 mph (120.7 km/h) | 74.64 mph (120.12 km/h) |
| 80 mph (128.75 km/h) | 79.61 mph (128.13 km/h) |
| 85 mph (136.79 km/h) | 84.59 mph (136.13 km/h) |
| 90 mph (144.84 km/h) | 89.57 mph (144.14 km/h) |
| 95 mph (152.89 km/h) | 94.54 mph (152.15 km/h) |
| 100 mph (160.93 km/h) | 99.52 mph (160.16 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
