Nice display! If I look close, I can see the little brackets the tires are sitting on. What holds the bikes upright? Also, what keeps them from rolling fore/aft?
I'm guessing they were hung upside down by the wheels when they were up high? I have no building with metal beams, but I could get a bunch of holes the way
@sambo42xa did. Are the tires up tight against the wall, and do you have to keep them full to prevent damage? I see they are hanging next to the air compressor...