Check out Instructables user lamoix’s indoor bike rack for his Portand bike-lover’s palace.
Like most houses in Portland, we have a lot of bicycles, and we are always coming and going on them, often changing out bikes several times a day. Not satisfied with outdoor parking, or stacks of bicycles in the workshop, I decided to build some indoor bike parking. It allows for both front or rear wheel parking, and fits eight bikes comfortably.
In principal, this rack is just a railing. The bikes are held in place by their wheels resting against the wood, with the tires keeping them from rolling. I was concerned that this design might put too much torque on the rims, and that a triangular two-touch system would be better, but this design works great, even with road race wheels.