Wrap-Up Next High Upper Knuckle Extension - BlackWrap Up Next (#0679 FD) High Upper Knuckle Extension Black Feature: For: Wrap Up Next GX Knuckle FSG Suspension With a special design to avoid tyre interference, the kingpin angle can be set from 0 degrees to 1. 5 4. 5 8 degrees. This extension can also be installed on the FSG suspension, creating a higher front and rear suspension. By tilting the pillow ball mounting part by 5 degrees, which optimized the ball's range of motion when setting the