Re:
12 L shaped brackets Simpson Strong tie brand, 4 wheels, I think I used deck wood (treated), and some deck screws. The hardest part was doing it alone! Because I did the two end inverted "t's" first, I had to join it to the cross beam. After that I basically spaced the hooks apart and staggered the bikes from handle bar up and handle bar down. I fit 2 on the end (you can't) see it very well....costed me about $175 CDN with taxes for supplies. Of course you will need a table saw or circular saw to cut. I did it about 3 years ago...trying to remember exactly how I did it. Someone wanted me to build them one....but never got back to me! I may market it....JK!