The MAC tire is the “WORLD's First Freestyle Folding tire”! This is not just a new tire like all the others, this one changes the weight of the complete bike dramatically because it's less rotating mass at the end of the frame and at the same time it strengthens a lot by using Kevlar material. Most tires blow up with big pressure and they get biger than labelled. The Kevlar strips hold everything in original shape and make the tire really, really light. This new tire is made of hard rubber and holds up to 120psi.