BMW Motorcycle R1100R front and rear turn signal bulbs utilize a P21W size. The replacement chart covers 1995 to 2000 production 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 R1100R uses the P21W bulb type across all listed model years, 1995-2000, for both front and rear turn signals.
The P21W is an ECE-standardized bulb, meaning it conforms to European and internationally recognized regulations for signaling applications.
P21W bulbs operate at 12 volts and consume 21 watts, which is the standard wattage for single-filament turn signal applications in this class of motorcycle.
The P21W uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin offset, distinguishing it from dual-contact bayonet variants.
Because the P21W is single-filament, each housing serves one dedicated function, as opposed to dual-filament bulbs that combine two functions such as braking and signaling within one unit.
The BA15s base is not interchangeable with the BA15d base, which carries two offset pins for dual-filament bulbs. Substituting a BA15d bulb into a BA15s socket is not physically compatible.
The R1100R uses the same P21W specification for both the front and rear turn signal positions across the entire 1995-2000 model year range, indicating no positional variation in bulb type.