Michelin has taken a cue from that old (and somewhat not so cool) Huey Lewis song “Hip to be Square,” but in this case square could be the new round. The Protek Max inner tubes, which we first heard about almost two years ago, feature a square profile and textured bumps that can help keep riders roller after a puncture.
These work along with a sealant and react in compression when punctured, and this reaction reportedly helps the tube close around any holes. The new tubes will be available this spring for around $13 and will be available for Presta and Schrader valves. How cool is that?