Suzuki Motorcycle GSX-S1000F Turn Signal Bulb Size
The Suzuki Motorcycle GSX-S1000F uses P21W bulbs for both front and rear turn signals, with this bulb size remaining consistent across the model line. The replacement chart covers 2016 to 2018 production years and documents the turn signal bulb specifications for this motorcycle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21W is the sole bulb type across all turn signal positions on the Suzuki Motorcycle GSX-S1000F, covering both front and rear housings for the 2016-2018 model years.
The P21W operates on a 12-volt electrical system and draws 21 watts, which is the standard power rating for single-filament automotive signalling applications.
This bulb uses a BA15s bayonet base, a single-contact fitting where the "s" designation indicates a single locating pin on the base collar, distinguishing it from the dual-pin BA15d variant.
The P21W is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its dedicated use in turn signal circuits rather than combined stop or tail light assemblies.
The P21W is rated to the ECE standard, a regulatory framework recognized across Europe and numerous international markets, governing output, color, and performance requirements for signalling bulbs.
Because the front and rear turn signal housings on the GSX-S1000F share the same P21W specification, a single bulb type is interchangeable across all four signal positions on the motorcycle.
The BA15s base is not interchangeable with BAY15d or BA15d bases despite physical similarities, as differences in pin count and offset affect fitment in the socket.