A garage door opener remote controller unit is mountable on the handlebar of a motorcycle or other handlebar steered vehicle and includes a radio frequency transmitter and a push button actuator for sending a door control signal. The controller unit includes a housing and opposed mounting parts for mounting the controller unit on a handlebar assembly. The controller unit is mounted on a handlebar assembly by screw type fasteners which secure the controller unit housing and mounting parts in assembly. At least one of the mounting parts may include a recess or channel for training vehicle control cables and electrical conductors therethrough and along the handlebar.