Suzuki Motorcycle LT-A450X KingQuad AXi 4x4 Brake Bulb Size

The Suzuki Motorcycle LT-A450X KingQuad AXi 4x4 brake uses a P21/5W bulb size for the lighting component. Data for the specified bulb covers the range from 2007 through 2010.

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
2007-2010	P21/5W

Bulb Specifications

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

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Additional Notes

The Suzuki LT-A450X KingQuad AXi 4x4 uses the P21/5W bulb for the brake light across the 2007-2010 model years.
The P21/5W is a dual-filament bulb, with one filament rated at 21W for the brake/stop function and a second filament rated at 5W for the tail/running light function.
The P21/5W operates on a 12V electrical system, consistent with standard automotive and powersports vehicle circuits.
The bulb 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.
Because the BAY15d base is offset, it is not interchangeable with the BA15d base, which shares the same physical size but has pins at equal heights. Substituting one for the other results in incorrect fitment.