US US20260109423A1
A bicycle frame with a front frame having top tube, down tube, and head tube connected together. A rear frame includes spaced-apart seat stays and chain stays with a bottom bracket shell, where rear ends connect to a rear drop out and front ends connect to the bottom bracket shell. A seat tube between front and rear frames has an upper tube connected to the top tube and a lower tube connected to the seat stays and bottom bracket shell. The upper and lower tubes rotate selectively relative to each other. A locking coupler secures the tubes together, featuring a male ball portion with spherical geometry and a female receptacle formed by a clamp bracket with opposed portions separated by a split opening. A cam lever provides clamping force to draw the clamp bracket portions together, securing the male ball portion within the female receptacle.
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