Thomas used two IKEA Kvartal wall fittings to hold the handlebars of his road bike. They will set you back $4.99 each. Creating this rack is pretty easy. What remains a challenge is finding the right spot for this. If you live in a smaller place, you won't have that much choice, but it's important to set this up in an area where the bike will be unobtrusive.
The way that this rack functions means that the saddle will rest against the wall and the rear wheel will rest on the floor. It takes away enough pressure so that the handlebar isn't under too much stress. All in all, it's quite a smart way of storing your bike. While you can't stack two of these over each other, you can stack a few of them right next to each other to create a rack space for your bikes. Varying the overall height by using an elevated resting place for the rear wheel will allow you to stack them efficiently. Thomas mentions that you should be careful when drilling the holes in the wall; the right measurements will ensure that you won't have to do this twice. The Kvartal hack is cheap and easy to create, allowing you to store your road bike nicely without creating too much of a fuss. (via Ikeahacker, photos by Thomas Stegelmann)