Suzuki Motorcycle LT-Z250 QuadSport Z Brake Bulb Size

The Suzuki Motorcycle LT-Z250 QuadSport Z brake utilizes a P21/5W bulb size for the lighting system. Data for the specific component covers the range from 2004 to 2009.

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
2004-2009	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 LT-Z250 QuadSport Z uses the P21/5W bulb for its brake light across the 2004-2009 model years.
The P21/5W is a dual-filament bulb, with one filament rated at 21 watts for the brake/stop function and a second filament rated at 5 watts for the tail/running light function.
The bulb operates on a 12-volt electrical system, consistent with standard automotive and powersports applications.
The P21/5W uses a BAY15d bayonet base, which features two offset pins at different heights to prevent incorrect insertion of a single-filament bulb into a dual-filament socket.
The P21/5W designation follows the ECE (Economic Commission for Europe) standard, a specification recognized across European and international markets.
Because the BAY15d base is keyed by pin offset, substituting a single-filament BAY15s bulb into the LT-Z250 QuadSport Z brake socket is not mechanically compatible without modification.