Suzuki Motorcycle LT-F400 Eiger Tail Light Bulb Size

The Suzuki Motorcycle LT-F400 Eiger tail light uses a P21/5W bulb size. The replacement chart covers 2002 to 2007 production years with corresponding bulb specifications.

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
2002-2007	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-F400 Eiger uses the P21/5W bulb for its tail light across the 2002-2007 model years.
The P21/5W is a dual-filament bulb, with one filament rated at 21 watts for braking or turn signal functions and a second filament rated at 5 watts for running light functions.
This bulb operates on a 12-volt electrical system, which is standard for small-displacement powersport vehicles.
The P21/5W uses a BAY15d bayonet base, a two-pin offset base design where the two pins are positioned at different heights to prevent incorrect insertion orientation.
The P21/5W is governed by ECE (Economic Commission for Europe) standards, meaning it is rated and tested for use in Europe and other markets that follow ECE lighting regulations.
Because the BAY15d base is offset, it is not interchangeable with the BAY15s base, which is a single-filament bayonet fitting with pins at equal heights. Substituting a single-filament bulb in place of the P21/5W would result in the loss of one lighting function.