Suzuki Motorcycle GSX250R front and rear turn signal bulbs utilize a P21W size across both positions. The replacement chart covers 2018 to 2019 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 P21W is the sole bulb type across all listed turn signal positions on the Suzuki Motorcycle GSX250R, appearing in both the front and rear turn signal assemblies for the 2018-2019 model years.
The P21W operates at 12 volts and consumes 21 watts, which is the standard wattage for single-filament automotive signalling applications under ECE regulations.
This bulb uses a BA15s bayonet base, a single-contact fitting where the "s" designation indicates a single pin offset to one side, distinguishing it from the dual-contact BA15d variant with which it is not interchangeable.
The P21W conforms to ECE standards, a regulatory framework recognized across Europe and numerous other markets worldwide, governing output, base dimensions, and performance tolerances.
Because the P21W is a single-filament bulb, it serves a dedicated signalling function only, without a secondary filament for combined stop or running light duties.