you have to press the hub (part with ur lugnuts in it) out of the spindle then the bearing out of the spindle and the race off the back of the hub (bc it usually seperates). I hate doing em bc i dont like using a press. i like just unbolting and bolting new ish on. not hard just time comsuming if its ur first time or dnt have access to a press and the stuff to hold the knuckle straight in the press.