BMW Motorcycle K75 front and rear turn signal bulbs utilize a P21W size across all applications. The replacement chart covers 1986 to 1995 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 K75 uses the P21W bulb size for both front and rear turn signals across all listed model years, spanning 1986-1995.
The P21W is an ECE-standardized bulb, meaning it conforms to European and internationally recognized automotive lighting regulations.
As a single-filament bulb, the P21W is dedicated solely to one lighting function, which in this application is turn signal operation.
The P21W operates at 12 volts and draws 21 watts, placing it in the standard wattage range for automotive turn signal applications.
The P21W uses a BA15s bayonet base, where "BA15" refers to the 15mm pin spacing and "s" denotes a single-contact configuration.
The BA15s base is distinct from the BA15d double-contact variant; substituting a BA15d bulb in a BA15s socket is not compatible due to the differing contact configurations.
Because the front and rear turn signals on the BMW Motorcycle K75 share the same P21W specification, both positions draw from the same bulb type.
The uniform P21W fitment across the full 1986-1995 production span indicates no bulb specification changes were introduced during that period for either turn signal position.