Vittoria: Vittoria presents Air-Liner, the ultimate tire accessory for mountain bike tires. Air-Liner is a foam-based tubular insert for tubeless tires designed to protect the rim, enhance grip and prevent punctures.This technical foam is made up by a new-generation polymer, and the entire tube comes through coring process. Differently from printing and extrusion – cheaper production processes used for equivalent products available in the market – coring does not alter the chemical structure of the polymer. As a matter of fact, the added value of Air-Liner lays in its high-quality production process.Air-Liner can be used on both standard wheels and tubeless-ready wheels, with both tubeless and tubeless-ready tires, and with any type of sealant – preferably without ammonia. In addition, it fits any type of valve for tubeless.Although Air-Liner polymer is slightly dense, it is very resistant. This particular structure provides the insert with light weight without compromising on resistance and duration: Air-Liner weight goes from 160 g to 220 g according to the size, and the product life cycle is 2,000 hours in normal conditions or one-hour run flat – calculation based on a rider of 80 kg of weight.Air-Liner is designed considering all the demands of each mountain bike discipline:Size S – Cross-Country / Marathon – from 1.9” to 2.2”Size M – All Mountain / Enduro – from 2.25” to 2.5”Size L – Enduro / Plus – from 2.5” to 2.7”Size XL – Plus / Fat – from 2.7” to 4.0”