BMW Motorcycle R1100RT headlight bulbs utilize a 9003 bulb size for both high beam and low beam applications. The replacement chart covers vehicle production spanning 1994 to 2001.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW Motorcycle R1100RT uses the 9003 bulb for both high beam and low beam headlight positions across all listed model years, spanning 1994-2001.
The 9003 is an ANSI-standardized bulb type recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament halogen design rated at 60 watts for high beam and 55 watts for low beam.
Because both headlight positions share the same 9003 specification, a single bulb type serves the entire headlight assembly on the R1100RT.
The 9003 bulb uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type is not universally interchangeable with other common automotive base designs, and substituting a bulb with a different base is not supported by these specifications.
The 9003 designation is the North American ANSI equivalent of the international H4 bulb. While these two types share the same physical and electrical characteristics, labeling differences between markets mean the designation on packaging may vary depending on region of purchase.
The dual-filament construction of the 9003 means both beam functions are housed within a single glass envelope, with each filament positioned at a different focal point to produce the distinct high and low beam outputs.