BMW Motorcycle R1200S front turn signal bulbs measure 921 in size, while rear turn signal bulbs measure 232 and 5008. The replacement chart covers 2006 to 2007 model 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 R1200S front turn signal uses the 921 bulb for both 2006 and 2007 model years.
The 921 is a T15 wedge-base bulb rated at 12V and 16W, conforming to ANSI standards for the US and Canadian markets.
The T15 wedge base means the bulb connects directly through two metal contacts at the base of the glass envelope, requiring no separate socket pins or bayonet locking mechanism.
The rear turn signal of the R1200S uses different bulb types across its two model years, with the 232 specified for 2007 and the 5008 specified for 2006.
The 232 is a festoon-style bulb with an SV8.5 base, rated at 12V and 3W. Festoon bulbs are cylindrical and make contact at each end rather than through a base socket.
The SV8.5 designation on the 232 bulb refers to a specific festoon cap size, which determines physical fitment in the housing.
The 5008 is a single-filament bulb with a BA15s bayonet base, rated at 12V. It is described as a lower-wattage variant of the 1156 bulb type.
The BA15s bayonet base features a single locating pin, which distinguishes it from the dual-pin BA15d base and makes the two non-interchangeable despite similar physical sizing.
Because the 2006 rear turn signal uses the 5008 and the 2007 uses the 232, these two bulbs are not interchangeable between model years despite both fitting the rear turn signal position.
All three bulb types listed, the 921, 232, and 5008, conform to ANSI standards applicable to the US and Canadian markets.