Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-21 | 90/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.09 (713.4) | 24.38 (619.2) | -3.71 (-94.2) -13.2% |
| Width inches (mm) | 3.94 (100) | 3.54 (90) | -0.39 (-10) -10% |
| Circum. inches (mm) | 88.24 (2241.21) | 76.59 (1945.27) | -11.65 (-295.94) -13.2% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.19 (81) | -0.35 (-9) -10% |
| Revolutions per mile (km) | 718.07 (446.19) | 827.31 (514.07) | 109.24 (67.88) 15.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.36 mph (27.94 km/h) |
| 25 mph (40.23 km/h) | 21.7 mph (34.92 km/h) |
| 30 mph (48.28 km/h) | 26.04 mph (41.91 km/h) |
| 35 mph (56.33 km/h) | 30.38 mph (48.89 km/h) |
| 40 mph (64.37 km/h) | 34.72 mph (55.87 km/h) |
| 45 mph (72.42 km/h) | 39.06 mph (62.86 km/h) |
| 50 mph (80.47 km/h) | 43.4 mph (69.84 km/h) |
| 55 mph (88.51 km/h) | 47.74 mph (76.83 km/h) |
| 60 mph (96.56 km/h) | 52.08 mph (83.81 km/h) |
| 65 mph (104.61 km/h) | 56.42 mph (90.79 km/h) |
| 70 mph (112.65 km/h) | 60.76 mph (97.78 km/h) |
| 75 mph (120.7 km/h) | 65.1 mph (104.76 km/h) |
| 80 mph (128.75 km/h) | 69.44 mph (111.75 km/h) |
| 85 mph (136.79 km/h) | 73.78 mph (118.73 km/h) |
| 90 mph (144.84 km/h) | 78.12 mph (125.72 km/h) |
| 95 mph (152.89 km/h) | 82.46 mph (132.7 km/h) |
| 100 mph (160.93 km/h) | 86.8 mph (139.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2105 | 2446 | 2634 | 2750 | 2876 | 2965 | 3064 | 3180 | 3342 | 3503 | 3682 | 3825 | 4085 | 4372 | 4596 | 4739 | 4820 | 5116 | 5528 | 6424 |
Better Fuel Economy Factory Ratios Increased Power
