BMW Motorcycle K1100RS high beam and low beam headlight bulbs both utilize a 9003 bulb size. The replacement chart covers vehicle production years spanning 1993 to 1996.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW Motorcycle K1100RS uses the 9003 bulb size for both high beam and low beam headlight positions across the 1993-1996 model years.
The 9003 is an ANSI-standard designation recognized in the United States and Canada, making it the North American equivalent of what is internationally classified as the H4 bulb type.
As a dual-filament halogen bulb, the 9003 houses two separate tungsten filaments within a single glass envelope, with one filament dedicated to high beam output and the other to low beam output.
The 9003 operates at 12 volts and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The P43t base is a bayonet-style mount with a 43mm collar, and its three asymmetrically placed pins ensure the bulb seats in only one rotational orientation, which is critical for correct filament alignment in a reflector housing.
Because the K1100RS uses the same 9003 bulb for both beam functions, a single bulb type serves the entire headlight assembly rather than requiring separate part numbers for each function.
The H4 and 9003 designations share the same physical and electrical construction, though substitution between the two should be confirmed against the P43t base specification before installation, as minor regional production variations exist.
The consistent use of the 9003 across all four model years means fitment is uniform throughout the full 1993-1996 production run of the K1100RS.