When there’s no pressure inside the tire, the foam material can fully expand to mostly fill the inside of the tire casing. In this way, riders can enjoy improved cornering traction and better ride comfort without worrying about the tire squirming around or denting (or cracking) a rim due to impact. Many foam inserts designed for the dirt (whether from Vittoria or one of the other multiple brands who now have such a thing) have a somewhat triangular or trapezoidal cross-section so as to maintain casing stability when running extra-low pressures. The new Air-Liners are essentially a downsized version of the foam inserts that Vittoria already offers for mountain and gravel bikes, albeit with a somewhat different mission statement and a different shape to suit. Remember those mysterious tire inserts that the EF-Education First team was supposedly using at the Tour de France last September? After several months of additional testing, Vittoria has finally lifted the lid on the new road-specific version of its Air-Liner foam tire inserts. Heading out the door? Read this article on the new Outside+ app available now on iOS devices for members!
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