Suzuki Motorcycle DL650 V-Strom Brake Bulb Size

The Suzuki Motorcycle DL650 V-Strom brake utilizes a P21/5W bulb size for the lighting system. Available information covers a specific time span from 2004 through 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
2011-2016	P21/5W
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 P21/5W is the sole brake bulb type specified for the Suzuki Motorcycle DL650 V-Strom across all listed model years from 2004-2016.
The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The higher 21W filament serves the brake function, while the lower 5W filament handles the tail light function.
The bulb operates on a 12V electrical system, which is standard for motorcycles of this class.
The P21/5W uses a BAY15d bayonet base. The BAY15d designation indicates an offset pin configuration, where the two retaining pins are positioned at different heights on the base. This offset prevents the bulb from being inserted in the wrong orientation, ensuring the correct filament aligns with each circuit.
The P21/5W conforms to ECE (Economic Commission for Europe) standards, indicating it is approved for road use across European and many worldwide markets.
Because the BAY15d base uses offset pins, it is not interchangeable with the BA15d base, which carries pins at equal heights. Substituting a BA15d bulb into a BAY15d socket is not possible without modification.
The P21/5W is also distinct from the P21W, which is a single-filament bulb sharing a similar appearance. Using a P21W in place of a P21/5W would disable the tail light function on the DL650 V-Strom.