I have two racks for my 6 bikes. One, a simple 2x4 lag screwed to the garage overhead with staggered hooks. Bikes hang form the front wheel, lowest bikes just off the floor, adjacent about 18" higher. Heaviest bikes go on the low hooks. (Farmers market bike, city bike.) Lightest bikes go on to a freestanding 2x4 tower in the center of the garage. 2x2s padded with innertube hang two bikes per side, high and low, by the top tube. 3 bikes hang there plus 2 frames.