A convenient and easy way to adjust the handlebar height is the shaft stem. The quick assembly by inserting the stem in the steerer tube and the fixation at the desired height. Many shaft stems also allow the adjustment of the angle. In combination with a height-adjustable saddle, an ergonomic and optimal sitting position of the driver can be achieved. A correctly adjusted stem and the ideal saddle height make cramping and pain in the back or arms a thing of the past.