Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-21 | 80/100-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.09 (713.4) | 24.3 (617.2) | -3.79 (-96.2) -13.5% |
| Width inches (mm) | 3.94 (100) | 3.15 (80) | -0.79 (-20) -20% |
| Circum. inches (mm) | 88.24 (2241.21) | 76.34 (1938.99) | -11.9 (-302.22) -13.5% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.15 (80) | -0.39 (-10) -11.1% |
| Revolutions per mile (km) | 718.07 (446.19) | 829.99 (515.73) | 111.92 (69.54) 15.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.3 mph (27.85 km/h) |
| 25 mph (40.23 km/h) | 21.63 mph (34.81 km/h) |
| 30 mph (48.28 km/h) | 25.95 mph (41.77 km/h) |
| 35 mph (56.33 km/h) | 30.28 mph (48.73 km/h) |
| 40 mph (64.37 km/h) | 34.61 mph (55.69 km/h) |
| 45 mph (72.42 km/h) | 38.93 mph (62.65 km/h) |
| 50 mph (80.47 km/h) | 43.26 mph (69.62 km/h) |
| 55 mph (88.51 km/h) | 47.58 mph (76.58 km/h) |
| 60 mph (96.56 km/h) | 51.91 mph (83.54 km/h) |
| 65 mph (104.61 km/h) | 56.23 mph (90.5 km/h) |
| 70 mph (112.65 km/h) | 60.56 mph (97.46 km/h) |
| 75 mph (120.7 km/h) | 64.89 mph (104.42 km/h) |
| 80 mph (128.75 km/h) | 69.21 mph (111.39 km/h) |
| 85 mph (136.79 km/h) | 73.54 mph (118.35 km/h) |
| 90 mph (144.84 km/h) | 77.86 mph (125.31 km/h) |
| 95 mph (152.89 km/h) | 82.19 mph (132.27 km/h) |
| 100 mph (160.93 km/h) | 86.52 mph (139.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2112 | 2454 | 2642 | 2759 | 2885 | 2975 | 3074 | 3191 | 3353 | 3514 | 3694 | 3838 | 4099 | 4386 | 4611 | 4755 | 4836 | 5132 | 5546 | 6444 |
Better Fuel Economy Factory Ratios Increased Power
