Michelin A1 AirComp Ultra Light 700 20/23c 52mm Presta TubeMichelin A1 AirComp Ultra Light 700 20/23c Presta Tube. Now anyone can get the advantage of our remarkably light "Service Course" ultralight butyl tubes. The combination of the AircompĀ® Ultra-light tube's extremely lightweight and consistent Michelin quality make these an obvious choice for high performance applications.086699879981