Suzuki Motorcycle DR-Z400SM Brake Bulb Size

The Suzuki Motorcycle DR-Z400SM brake utilizes a P21/5W bulb size for illumination across the various production versions listed within the provided technical data set. Available information covers a specific time span starting from 2005 and ending in 2019 for the specified component.

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
2013-2019	P21/5W
2005-2009	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-Z400SM uses the P21/5W bulb type across all specified model years from 2005 to 2019 for its brake light function.
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 or parking light function.
This bulb operates on a 12-volt electrical system, which is standard for motorcycles in this class.
The P21/5W uses a BAY15d bayonet base, an offset twin-pin mount that physically prevents incorrect installation by ensuring the two filaments align with their intended circuits.
The P21/5W is governed by ECE standards, meaning it is recognized for road use across Europe and many other markets worldwide.
Because the BAY15d base is offset, it is not interchangeable with the BA15d base, which shares a similar appearance but positions its pins symmetrically. Substituting one for the other is not possible without modification.