SORBA Tri-Cities, formerly Northeast Tennessee Mountain Bike Association, is an advocacy organization dedicated to the enhancement of mountain biking and the preservation of, and access to, trails across Northeast Tennessee.

Formed in December 1998, SORBA Tri-Cities has been creating opportunities for mountain biking as well as promoting responsible trail use. SORBA Tri-Cities is a chapter of the Southern Off-Road Bicycle Association (SORBA) and a member of the Tennessee Mountain Biking Allicance (TMBA).