Suzuki Motorcycle DR-Z400S Brake Bulb Size

The Suzuki Motorcycle DR-Z400S utilizes a P21/5W bulb for the brake component to provide illumination during operation. Available information covers the specific time range from 2000 through 2019 for the specified equipment.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2011-2019	P21/5W
2000-2009	P21/5W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

Other Locations

Additional Notes

The Suzuki Motorcycle DR-Z400S uses the P21/5W bulb type across all listed model years from 2000-2019 for the brake light position.
The P21/5W is a dual-filament bulb, with one filament rated at 21 watts for the brake or turn signal function and a second filament rated at 5 watts for the tail light function.
This bulb operates on a 12-volt electrical system, which is standard for motorcycles in this category.
The P21/5W uses a BAY15d bayonet base, which features two offset pins at different heights to ensure correct polarity orientation during installation, preventing the filaments from being connected to the wrong circuit.
The P21/5W conforms to ECE (Economic Commission for Europe) standards, a regulatory framework recognized across Europe and numerous other markets worldwide.
The BAY15d base of the P21/5W is not interchangeable with the BA15d base, which has pins at the same height, or the BA15s single-contact base; substituting an incorrect base type would result in fitment failure or circuit mismatch.