A bicycle including a frame that has a head tube. The bicycle also includes a fork that is rotationally coupled to the head tube and that has a steerer tube extending upward through the head tube, a wheel rotationally coupled to the fork, a handlebar, and a stem assembly. The stem assembly is coupled to and extends from the steerer tube to attach the handlebar to the fork. The stem assembly includes a stem, a shim that is coupled to the stem, and a clamp contacting both the shim and the handlebar to secure the handlebar to the stem assembly.