Polaris 500 Classic Brake Bulb Size

The Polaris 500 Classic brake utilizes 3157, 2458, and 921 bulb sizes depending on the specific version. Data for the provided components covers the period from 1999 through 2006.

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
2005-2006	3157
1999-2004	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is a single-filament wedge type rated at 12 volts and 16 watts, conforming to ANSI standards applicable in the United States and Canada. Its T15 designation refers to the bulb's tubular wedge form factor.
The 3157 bulb is a dual-filament wedge type rated at 12 volts with a split wattage of 27 watts and 7 watts, also conforming to ANSI standards for the United States and Canada. Its T25 designation indicates a larger wedge form factor than the T15.
The dual-filament design of the 3157 allows it to serve both a high-intensity brake function and a lower-intensity running light function within a single bulb, which is a distinct functional characteristic not shared by the single-filament 921.
The Polaris 500 Classic used the 921 bulb for the brake position across the 1999-2004 model years, representing the longer of the two fitment periods covered in these specifications.
The 3157 bulb applies to the 2005-2006 model years of the Polaris 500 Classic, marking a change in brake bulb specification relative to earlier model years.
The 921 and 3157 are not interchangeable. Beyond the difference in filament count, the T15 and T25 wedge bases are physically distinct sizes, and the wattage ratings differ between the two types.