a service module for bicycles comprising a housing having outer plastic panels to carry tools . in one form of the invention the housing is mounted for free rotation on the lower end of a telescopic support , and the support is spring biased to a retracted position so that the unit can be stored in an upper position . in use , the housing is pulled down and locked in a lower position . in a second form of the invention , the housing is adjustably mounted on the upper end of a supporting column and the housing can be rotated with respect to the column to provide access to the tools .