BMW Motorcycle R80 headlight bulbs utilize a 9003 size for both high and low beam functions. The replacement chart covers 1976 to 1994 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 R80 uses the 9003 bulb for both high beam and low beam headlight positions across all listed model years from 1976-1994, with the exception of 1988-1991, which are not present in the specifications.
The 9003 is an ANSI-standard halogen bulb recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament design rated at 60 watts for high beam and 55 watts for low beam.
The dual-filament construction of the 9003 allows a single bulb to serve both the high beam and low beam functions, which is reflected in the R80 specifications where the same bulb size is listed for both positions.
The 9003 uses a P43t base, a bayonet-style mount with a 43mm collar, which physically determines fitment and is not interchangeable with single-filament bases such as the P14.5s or P22d found on other halogen types.
The 9003 is functionally equivalent to the H4 bulb used in international markets, sharing the same P43t base and dual-filament configuration, though the 9003 designation is specific to the ANSI classification system used in North America.
Because the high beam and low beam positions on the BMW Motorcycle R80 share the same 9003 specification, a single bulb type covers both lighting functions, and substituting a single-filament bulb in either position would not satisfy the original dual-filament requirement.