BMW Motorcycle R80 front and rear turn signal bulbs use P21W size across all applications. The replacement chart covers 1976 to 1994 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 R80 uses the P21W bulb for both front and rear turn signals across all listed model years from 1976-1994, with the exception of 1988-1991, which are not present in the specifications.
The P21W is an ECE-standardized bulb type, meaning its physical and electrical characteristics conform to a regulated international specification widely adopted across Europe and other global markets.
The P21W operates at 12 volts and consumes 21 watts, which is the conventional power rating for single-filament automotive signalling applications.
The P21W is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament types that handle two functions such as combined stop and tail duties.
The P21W uses a BA15s bayonet base, where "BA15" denotes a 15mm bayonet cap and the "s" suffix indicates a single-contact configuration at the base.
The BA15s single-contact base is not interchangeable with the BA15d base, which carries a dual-contact configuration used on two-filament bulbs. Substituting one for the other is not possible without a socket modification.
Because the BMW Motorcycle R80 uses the same P21W specification for both the front and rear turn signal positions, a single bulb type covers both locations across all listed years.
The consistent use of the P21W across the entire listed production span of the R80 indicates no bulb type variation between earlier and later model years within the specifications provided.