Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/100-21 | 100/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.3 (693.4) | 28.87 (733.4) | 1.57 (40) 5.8% |
| Width inches (mm) | 3.15 (80) | 3.94 (100) | 0.79 (20) 25% |
| Circum. inches (mm) | 85.76 (2178.38) | 90.71 (2304.04) | 4.95 (125.66) 5.8% |
| Sidewall Height inches (mm) | 3.15 (80) | 3.94 (100) | 0.79 (20) 25% |
| Revolutions per mile (km) | 738.78 (459.06) | 698.49 (434.02) | -40.29 (-25.04) -5.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.15 mph (34.04 km/h) |
| 25 mph (40.23 km/h) | 26.44 mph (42.55 km/h) |
| 30 mph (48.28 km/h) | 31.73 mph (51.07 km/h) |
| 35 mph (56.33 km/h) | 37.02 mph (59.58 km/h) |
| 40 mph (64.37 km/h) | 42.31 mph (68.09 km/h) |
| 45 mph (72.42 km/h) | 47.6 mph (76.6 km/h) |
| 50 mph (80.47 km/h) | 52.88 mph (85.11 km/h) |
| 55 mph (88.51 km/h) | 58.17 mph (93.62 km/h) |
| 60 mph (96.56 km/h) | 63.46 mph (102.13 km/h) |
| 65 mph (104.61 km/h) | 68.75 mph (110.64 km/h) |
| 70 mph (112.65 km/h) | 74.04 mph (119.15 km/h) |
| 75 mph (120.7 km/h) | 79.33 mph (127.66 km/h) |
| 80 mph (128.75 km/h) | 84.61 mph (136.17 km/h) |
| 85 mph (136.79 km/h) | 89.9 mph (144.69 km/h) |
| 90 mph (144.84 km/h) | 95.19 mph (153.2 km/h) |
| 95 mph (152.89 km/h) | 100.48 mph (161.71 km/h) |
| 100 mph (160.93 km/h) | 105.77 mph (170.22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1778 | 2065 | 2224 | 2322 | 2428 | 2504 | 2587 | 2685 | 2821 | 2957 | 3109 | 3230 | 3449 | 3691 | 3880 | 4001 | 4069 | 4319 | 4667 | 5423 |
Better Fuel Economy Factory Ratios Increased Power
