Ski-Doo Summit 800 Adrenaline Brake Bulb Size

The Ski-Doo Summit 800 Adrenaline brake bulb uses 2 distinct sizes: 1157 and 921, with the specific bulb size varying by model year. The replacement chart covers vehicle production data spanning 2003 to 2008.

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
2008	1157	P21/5W	Check Price
2007	921	W16W	Check Price
2003-2006	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
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The 1157 is a dual-filament bulb operating at 12V with a 21W high filament and a 5W low filament, mounted on a BAY15d bayonet base. The two filaments serve separate functions within a single housing, which is a defining characteristic of this bulb type.
The 921 is a single-filament wedge bulb of the T15 type, rated at 12V and 16W. Unlike the 1157, it has no base pins and is held in place by the tension of its wedge-shaped glass envelope against the socket walls.
The Ski-Doo Summit 800 Adrenaline used the 1157 bulb for the brake position across the 2003-2006 and 2008 model years, making it the predominant brake bulb specification across this vehicle's production run.
The 2007 Ski-Doo Summit 800 Adrenaline specifies the 921 wedge bulb rather than the 1157, representing a distinct fitment difference for that model year relative to the surrounding years.
The 1157 and 921 are not interchangeable. The 1157 uses a BAY15d bayonet base, while the 921 uses a wedge-style socket, meaning the physical mounting mechanisms are incompatible with one another.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating they meet a defined set of dimensional and electrical performance criteria within those markets.