Suzuki Motorcycle TU250X Brake Bulb Size

The Suzuki Motorcycle TU250X brake component requires a P21/5W bulb size for proper operation and visibility on the road. Data for the specified lighting equipment covers the range from 2009 through 2019.

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
2012-2019	P21/5W
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 TU250X uses the P21/5W bulb for its brake light across the 2009 and 2012-2019 model years.
The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The 21W filament serves the brake and turn signal function, while the 5W filament handles the tail light function.
This bulb operates on a 12V electrical system, which is standard for motorcycles in this class.
The P21/5W uses a BAY15d bayonet base. The BAY15d designation indicates an offset pin configuration, where the two pins are positioned at different heights on the base. This offset prevents the bulb from being inserted in the wrong orientation, which would cause the filaments to operate in reversed roles.
The P21/5W is governed by ECE (Economic Commission for Europe) standards, giving it broad acceptance across European and international markets.
The BAY15d base of the P21/5W is not interchangeable with the BA15d base, which shares a similar bayonet style but features pins at equal heights. Substituting one for the other is not possible without modification to the socket.
The P21/5W is also sometimes referenced as a 1157-equivalent in North American markets, though the 1157 follows SAE rather than ECE standards and may carry slightly different electrical tolerances.