Triumph Rocket III Classic Tourer Headlight Bulb Size
The Triumph Rocket III Classic Tourer headlight bulb uses a 9003 size for both high and low beam functions. The replacement chart covers vehicle production spanning 2007 to 2011 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Triumph Rocket III Classic Tourer uses the 9003 bulb for both high beam and low beam headlight positions across the 2007-2011 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both high and low beam functions within one housing.
The 9003 operates at 12 volts and carries a 60W rating for the high beam filament and a 55W rating for the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar, and this base type determines physical fitment into the headlight socket.
The 9003 designation follows the ANSI standard used in the United States and Canada, and it is electrically and physically equivalent to the HB2 designation used in other markets.
Because the same bulb type governs both beam functions, a single replacement part covers the entire headlight assembly on the Triumph Rocket III Classic Tourer for the 2007-2011 model years.
The 9003 and H4 bulbs share the same P43t base and dual-filament configuration, though they originate from different standardization bodies, and cross-compatibility depends on the specific socket design of the vehicle.