In diploma thesis Construction of electric motorcycles I deal with issue of electric motorcycles, their types, constructions, advantages and their use. One part includes description of tractions and transmissions. Next part describes batteries, which are necessary in electric vehicles. The aim of this work is to compare different solutions of vehicle constructions. Experiment is about two constructions of quad. This quad used combustion engine and was modified to electric power. Electric quad was tested on power testing stand. Experimental quad constructions which were used were compared and evaluated. Experiment included test of stamina of fully charged battery.