The Triumph Speedmaster uses a 9003 bulb size for both high beam and low beam headlight applications. Replacement specifications in the chart span 2003 to 2016 model years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Triumph Speedmaster uses the 9003 bulb for both high beam and low beam headlights across all model years from 2003-2016.
The 9003 is an ANSI-standard bulb recognized in the United States and Canada, making it a widely available halogen type in North American markets.
As a dual-filament bulb, the 9003 houses two separate filaments within a single unit, one serving the high beam function and the other serving the low beam function.
The 9003 operates on a 12-volt electrical system and draws 60 watts on the high beam filament and 55 watts on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm flange, and this base type determines physical fitment into the headlight housing.
Because the same 9003 bulb specification applies to both the high beam and low beam positions, the Speedmaster uses a single bulb type to handle both lighting functions rather than separate bulbs for each.
The 9003 bulb is interchangeable with the H4 bulb in terms of filament and voltage ratings, though the H4 designation follows ECE standards used outside North America while 9003 follows the ANSI designation used within it.
The consistent 9003 specification across the entire 2003-2016 model range indicates no headlight housing redesign occurred during that period that would have required a different bulb fitment.