Based on a study of 470 injured motorized two-wheel-riders improvements and conceptions of an cptimal protection was described. It was found, that a protection against fractures is not given by commonly used leather clothes. The aim of better protection must be by correlation of qualities from shock absorption and power distribution. These two ways of safety-yield is realizable from a compound-system-protector consisted of a hard-shell material with shock absorbing foam inside. The possibilities of the varying protections with and without plate is quantified in this study.