BMW Motorcycle R100 uses 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1976 to 1995 production years 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 BMW Motorcycle R100 uses the 9003 bulb size for both the high beam and low beam headlight positions across all specified model years from 1976-1995, with the single exception of 1986, which is not present in the specifications.
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 on a 12-volt electrical system and carries a wattage rating of 60W on the high beam filament and 55W on 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 housing.
The 9003 is designated as an ANSI standard bulb applicable in the United States and Canada, distinguishing it from the European H4 bulb, which shares the same dual-filament halogen design and wattage ratings but uses a different base configuration and is not directly interchangeable despite the functional similarities.
Because the same 9003 bulb size is specified for both the high beam and low beam positions on the BMW Motorcycle R100, the headlight assembly relies on a single bulb to fulfill both lighting functions rather than separate bulbs for each beam.