the wheel of mainz or mainzer rad, in german, was the coat of arms of the archbishopric of mainz and thus also of the electorate of mainz (kurmainz), in rhineland-palatinate, germany. it consists of a silver wheel with six spokes on a red background. the wheel can also be found in stonemasons' carvings (e.g. landmarks) and similar objects. currently, the city of mainz uses a double wheel connected by a silver cross.