Tubeless tire insert

A tubeless tire assembly, comprising:

• a tire comprising beads;
• a wheel rim comprising a rim bed;
• an insert comprising:
• an annular body having shock absorbing characteristics;
• a positioning system configured to vary a mean inner diameter of the insert,
• wherein
• the insert has a mean inner diameter X when the tire is being installed on the rim, and
• the insert has a mean inner diameter Y when the tire is installed on the rim, where X is greater than Y.

A system for sealing a tubeless tire with a wheel rim, the system comprising:

• a wheel rim comprising a rim bed with sidewalls;
• a tubeless tire comprising:
• a first bead, a second bead, and an internal fluid chamber when the tubeless tire is mounted on the wheel rim;
• an insert disposed within the internal fluid chamber, the insert configured to be pressed into the rim bed once the tubeless tire is mounted on the wheel rim,
• a positioning system configured to vary a mean inner diameter of the insert, wherein
• the insert has the mean inner diameter X when the tire is being installed on the rim;
• and
• the insert has the mean inner diameter Y when the tire is installed on the rim, where X is greater than Y.