Harley-Davidson FXB Sturgis Brake Bulb Size

Harley-Davidson FXB Sturgis brake bulb utilizes a 1157 size bulb for rear lighting applications. The replacement chart covers 1980 to 1982 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	US Type	EU Type	Shop
1980-1982	1157	P21/5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price

Other Locations

Additional Notes

The 1157 is the sole brake bulb type listed for the Harley-Davidson FXB Sturgis across the 1980-1982 model years.
The 1157 is an ANSI-standardized bulb recognized in both the United States and Canada, operating on a 12-volt electrical system.
As a dual-filament bulb, the 1157 carries two separate wattage ratings: 21W for the high-intensity filament and 5W for the low-intensity filament, allowing it to serve both brake and running light functions within a single housing.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design in which the two pins are positioned at different heights to prevent incorrect insertion during fitment.
The BAY15d base is specific to dual-filament applications; single-filament bayonet bulbs use a different pin configuration and are not interchangeable with the 1157 in this application.