Harley-Davidson FLHRC Road King Classic Turn Signal Bulb Size

Harley-Davidson FLHRC Road King Classic rear turn signal bulbs use a P21W size, designated as 199 in standard bulb nomenclature. The replacement chart covers 2007 through 2013 model years with corresponding bulb size specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Rear Turn Signal

Years	Bulb Size
2010-2013	P21W
2009	199
2007-2008	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	199

Other Locations

Additional Notes

The P21W and 199 bulbs share identical base and electrical specifications: both use the BA15s single-contact bayonet base and operate at 12V with a 21W output, making them physically and electrically equivalent in practice.
The P21W designation follows ECE standards used in Europe and worldwide markets, while the 199 designation follows ANSI standards used in North American markets. The two naming conventions reflect regional certification systems rather than differences in the bulb itself.
The 199 is classified as a variant of the widely used 1156 bulb type, which shares the same BA15s base and single-filament construction.
The Harley-Davidson FLHRC Road King Classic uses the P21W for rear turn signals across the 2007-2008 and 2010-2013 model years, making it the predominant fitment across the listed range.
The 2009 model year specifies the 199 bulb for the rear turn signal position, which represents the sole instance of the ANSI-designated type within the listed specifications.
The single-filament design of both bulb types means they are dedicated signalling bulbs, as opposed to dual-filament types that serve combined stop and turn functions.