Tubeless InsertArmour Tubeless is an Aither 1. 1 polymer based insert that floats between tire and rim. Its shape allows for a fluid and natural driving style. The insert is designed to absorb vibrations and shocks as much as possible, thus making your ride quieter and more comfortable. Furthermore, it adapts to the terrain at every turn thanks to the flexibility of the lateral wings which deform, internally supporting the tire.