BMW Motorcycle R65 front and rear turn signal bulbs utilize a P21W size across all applications. The replacement chart covers 1978 to 1987 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 R65 uses the P21W bulb size for both front and rear turn signals across all model years from 1978-1987.
The P21W is a single-filament bulb, meaning it serves one lighting function rather than combining two functions such as braking and signalling within the same unit.
P21W bulbs operate at 12 volts and 21 watts, which places them in the standard range for automotive turn signal applications.
The P21W uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design is consistent with the bulb's single-filament construction.
The P21W designation follows ECE (Economic Commission for Europe) standards, indicating the bulb conforms to internationally recognized specifications used across Europe and other world markets.
Because the BMW Motorcycle R65 (1978-1987) uses the same P21W specification for both front and rear positions, the bulbs are physically interchangeable between those two locations on the motorcycle.
The consistent use of P21W across all ten model years means no year-specific fitment distinctions exist within this range for either the front or rear turn signal positions.