With your tubulars tucked safely away for race day, the last thing you want to get in the way of a training ride is an ill-timed flat from lightweight tubes better suited for road hill climbs. With thicker rubber, the Michelin Airstop Cyclocross Tube weighs a little bit more than super lightweight liners but fends off flats and air loss so you can tackle cyclocross training and gravel rides with confidence.