A wireless bicycle communication apparatus comprises an information receiver and a wireless transmitter. A support is slidingly received by horizontal extending guide grooves in the guide rails. The preferred configuration conforms to the bottom of both K-style and half round gutters and includes a neck with an acme screw throat, protruding from a rectangular, two edged blade, positioned from the neck at an oblique angle. The PCB assembly may be attached directly to the heat sink to facilitate thermal transfer characteristics so that components are cooled without the need for a fan.