An inline skate with changeable length has an inner boot, an adjusting device, an outer boot and a wheel assembly. The display includes a graphical user interface with the load test being divided into several test phases and on the graphical user interface functionalities being assigned to these test phases. The speed of the electric machine is set independently of the speed of the internal combustion engine, in order to supply the transmission with a flow of a volume hydraulic fluid required for the operating point of the transmission present at the time. Additionally, the copolymers comprise an acidic moiety, derived from a polycarboxylic acid, and a biobeneficial moiety.