Patent ID: 8807585

Claim:
A bicycle seat tube assembly, comprising: an arced component including a lower curved surface having a plurality of holes therein; a bottom bracket positioned below the arced component; a seat tube including a pivot attachment at a lower end of the seat tube, wherein the pivot attachment is coupled to the bottom bracket so that the arced component is pivotable relative to the seat tube about the bottom bracket, resulting in a plurality of seat tube positions between a fully forward position and a fully back position; and a locking mechanism configured to selectively lock the seat tube to the arced component at one of the seat tube positions, wherein the locking mechanism includes a lock ring with a plurality of lock pins and a spring that pushes the lock ring towards the arced component, wherein the lock ring and the spring surround the seat tube, and wherein the lock ring is movable between a locked position, in which the lock pins are inserted into the holes, and an unlocked position, in which the lock pins are removed from the holes and the arced component is free to pivot about the bottom bracket.