BMW Motorcycle K1200S front turn signal bulbs measure 921 in size, while rear turn signal bulbs measure 5008 and 232 in size. The replacement chart covers 2005 through 2008 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW Motorcycle K1200S uses three distinct bulb types across its front and rear turn signal positions: the 921, 5008, and 232, all of which conform to ANSI standards applicable in the US and Canada.
The 921 is a T15 wedge-base bulb rated at 12V and 16W. The wedge base design means the bulb is held in place by tension from the socket rather than a locking mechanism, and the T15 designation refers to its tubular glass envelope width.
The front turn signal on the K1200S uses the 921 bulb across all model years covered in the specifications, specifically 2005-2008.
The rear turn signal position does not use a single consistent bulb type across all years. The 5008 is fitted in 2005 and 2008, while the 232 is fitted in 2006-2007, indicating that direct year-to-year interchangeability at the rear position cannot be assumed.
The 5008 is a single-filament bulb with a BA15s bayonet base, operating at 12V. It is described as a lower wattage variant of the 1156, meaning it shares the same base type as the 1156 but draws less power, which is a relevant distinction when considering substitutions.
The 232 is a festoon-style bulb with an SV8.5 base, rated at 12V and 3W. Festoon bulbs make contact at each end of the cylindrical body rather than through a base pin or wedge, and the SV8.5 designation refers to the contact cap width.
The 921 at 16W and the 232 at 3W represent a significant wattage difference. Substituting one for the other in any position would be electrically incompatible and is not supported by the specifications.
Because the rear turn signal of the K1200S alternates between the 5008 and 232 depending on the model year, the correct bulb type for a specific unit is determined by its year of manufacture rather than by a universal fitment for the model.