BMW Motorcycle R75/6 front and rear turn signal bulbs utilize P21W size specifications. The replacement chart covers 1973 to 1976 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW Motorcycle R75/6 uses the P21W bulb type across all listed model years, 1973-1976, for both front and rear turn signals.
The P21W is an ECE-standardized bulb, meaning it conforms to the Economic Commission for Europe's regulations governing automotive lighting, which are widely adopted across European and international markets.
The P21W operates at 12 volts and 21 watts, a wattage rating typical of single-filament turn signal applications where a distinct, high-visibility flash is required.
The bulb uses a BA15s bayonet base, where "BA" denotes a bayonet cap fitting, "15" refers to the 15mm base width, and the lowercase "s" indicates a single contact at the base, corresponding to its single-filament design.
Because the P21W is a single-filament bulb, it serves one dedicated function per socket, which in the R75/6 is exclusively turn signal operation rather than a combined stop and tail function.
The front and rear turn signal positions on the R75/6 share an identical bulb specification across all listed years, meaning both positions accept the same P21W unit without substitution differences between them.