Harley-Davidson FLHX Street Glide Brake Bulb Size

The Harley-Davidson FLHX Street Glide uses a 3157 bulb size for brake applications. The replacement chart covers 2019 through 2023 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.

Bulb Size by Year Range

Years	Bulb Size
2022-2023	3157
2019	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

Other Locations

Additional Notes

The 3157 is the brake bulb size specified for the Harley-Davidson FLHX Street Glide across the 2019, 2022, and 2023 model years.
The 3157 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard used in the United States and Canada.
As a dual-filament bulb, the 3157 operates two separate filaments within a single housing, one rated at 27W for high-intensity functions such as braking, and one at 7W for lower-intensity functions such as running lights.
The 3157 follows a T25 wedge form factor, which refers to its tapered, wedge-style base rather than a bayonet or screw-in mount, and its 25mm bulb envelope width.
The 3157 operates on a 12V electrical system, consistent with standard automotive and motorcycle voltage.
The dual-filament design of the 3157 means a single-filament replacement such as the 3156 would not replicate full functionality, as the 3156 lacks the secondary low-wattage filament present in the 3157.