A bicycle comprises a front wheel, a rear wheel, a frame structure including a hollow seat tube. The bicycle further comprises a dropper seat post supported by the hollow seat tube, a loop stay positioned in the frame structure below the dropper seat post, and a control housing positioned in the frame structure for actuating the dropper seat post. The control housing includes a lower loop wrapped around at least a portion of the loop stay. The bicycle may further comprise a motor assembly coupled to the frame structure by a motor fastener, wherein the loop stay is coupled to the frame structure by the motor fastener. The frame structure may further include a top tube and a diagonal tube (e.g., a sided tube) coupling the top tube with the hollow seat tube, and the control housing may be at least partially positioned in the diagonal tube.