A height detection system of a motorcycle for determining a load-dependent height of a rear carrier part in relation to a rear wheel swing arm of the motorcycle includes a measuring device connecting the rear carrier part and the rear wheel swing arm for measuring the distance between the rear carrier part and the rear wheel swing arm, and a fastening web formed integrally and protruding from the rear carrier part in the direction of the rear wheel swing arm. The fastening web includes a lateral bearing face configured to receive a rear carrier end of the measuring device.