Hanging your bikes up is disrespectful to them. It is a form of torture, or BD/SM. Also, don't crowd them by putting your car in the garage. Ideally, the bikes should be inside, in a temperature-controlled room with a sealed, argon atmosphere, but at the very least, the bikes should have free reign of the garage. Store them upright, and every six hours, turn their wheels 90° counter-clockwise, so that the tire rubber doesn't distort, and the sealant (if you run tubeless) doesn't pool and harden in one spot.