The Green Zebra Market up on N Lombard and Peninsular has a bike fix-it station, which is great. And there is the tube vending machine, which is also a great concept. The problem is, with only five slots, those slots have to be the most common/"popular" tire/tube sizes. Out of my three regular bikes, only one would be able to use the tubes out of here: my Raleigh Crested Butte (26"x 2.0"). My 700C bike, the Bridgestone XO-3 uses 42mm wide tires, and the widest tube size here is 32mm. And my Raleigh Wayfarer is the old oddball 650A/26"x 1 3/8"/590mm size, which would probably only be found if this machine had like 15 slots (if at all). This is a reason why I always carry a spare tube with all my bikes, in addition to a patch kit.