I've been hanging them by the front wheel, rear resting against the wall for years. Easy. Wheelie the bike, lift and drop the front rim onto the hook. Space the hooks so the HBs overlap. Stagger the hooks vertically say 16", low hook so wheels are a couple of inches off the floor. Put the heavy bikes on the low hooks. Spare wheels can hang over the low hooks. Boxes or shelves can be under the high bikes. This system is easy with 30-35 pound bikes. It is equally easy to get the bikes down.

Ben