Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/100-21 | 110/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.3 (693.4) | 25.8 (655.2) | -1.5 (-38.2) -5.5% |
| Width inches (mm) | 3.15 (80) | 4.33 (110) | 1.18 (30) 37.5% |
| Circum. inches (mm) | 85.76 (2178.38) | 81.04 (2058.37) | -4.72 (-120.01) -5.5% |
| Sidewall Height inches (mm) | 3.15 (80) | 3.9 (99) | 0.75 (19) 23.8% |
| Revolutions per mile (km) | 738.78 (459.06) | 781.85 (485.82) | 43.07 (26.76) 5.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.9 mph (30.41 km/h) |
| 25 mph (40.23 km/h) | 23.62 mph (38.02 km/h) |
| 30 mph (48.28 km/h) | 28.35 mph (45.62 km/h) |
| 35 mph (56.33 km/h) | 33.07 mph (53.22 km/h) |
| 40 mph (64.37 km/h) | 37.8 mph (60.83 km/h) |
| 45 mph (72.42 km/h) | 42.52 mph (68.43 km/h) |
| 50 mph (80.47 km/h) | 47.25 mph (76.03 km/h) |
| 55 mph (88.51 km/h) | 51.97 mph (83.64 km/h) |
| 60 mph (96.56 km/h) | 56.69 mph (91.24 km/h) |
| 65 mph (104.61 km/h) | 61.42 mph (98.84 km/h) |
| 70 mph (112.65 km/h) | 66.14 mph (106.45 km/h) |
| 75 mph (120.7 km/h) | 70.87 mph (114.05 km/h) |
| 80 mph (128.75 km/h) | 75.59 mph (121.65 km/h) |
| 85 mph (136.79 km/h) | 80.32 mph (129.26 km/h) |
| 90 mph (144.84 km/h) | 85.04 mph (136.86 km/h) |
| 95 mph (152.89 km/h) | 89.77 mph (144.47 km/h) |
| 100 mph (160.93 km/h) | 94.49 mph (152.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2311 | 2489 | 2599 | 2718 | 2802 | 2896 | 3006 | 3158 | 3310 | 3480 | 3615 | 3861 | 4132 | 4343 | 4479 | 4555 | 4834 | 5224 | 6071 |
Better Fuel Economy Factory Ratios Increased Power
