Harley-Davidson FLHRXS Road King Special Headlight Bulb Size
Harley-Davidson FLHRXS Road King Special headlight bulbs utilize an H9 size for high beam and H11 size for low beam applications. The replacement chart covers 2017 through 2020 model 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.
The Harley-Davidson FLHRXS Road King Special uses the H9 bulb for the high beam headlight across the 2017-2020 model years.
The H9 is a single-filament halogen bulb operating at 12V and 65W, built to the ECE standard with a PGJ19-5 base, and carries approval for use in both European and US markets.
The low beam headlight on the same vehicle uses the H11 bulb across the same 2017-2020 model year range.
The H11 is a single-filament halogen bulb rated at 12V and 55W, also conforming to the ECE standard, and fitted with a PGJ19-2 base rather than the PGJ19-5 found on the H9.
Although the H9 and H11 share the same voltage rating and both follow the ECE standard, their wattage and base types differ, making them non-interchangeable between the high and low beam positions.
The distinction between the PGJ19-5 base of the H9 and the PGJ19-2 base of the H11 is a physical fitment difference that prevents cross-installation between the two sockets.
The 10-watt difference between the H9 at 65W and the H11 at 55W reflects the higher output typically assigned to high beam applications relative to low beam ones.
Both bulb types carry ECE approval as well as US market approval, meaning either type is sourced from a broadly standardized supply of replacement bulbs.