Definitions for "Chainstays"
Keywords:  dropouts, bracket, rear, bottom, wheel
Two of these; they are the tubes leading from the bottom bracket to the rear hub axle. They are part of the frame and have the dropouts that hold your rear wheel in place.
the bottom tubes of the rear triangle of a frame.
The frame tubes that run horizontally from the bottom bracket shell to the rear dropouts where the wheel is attached.