Ski-Doo Summit 800 Everest Brake Bulb Size

Ski-Doo Summit 800 Everest brake bulbs utilize a P21/5W or 921 size specification for this snowmobile model. The replacement chart covers 2007 through 2010 production years with corresponding bulb size data.

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
2008-2010	1157	P21/5W	Check Price
2007	921	W16W	Check Price

Bulb Specifications

Description	Type	Shop
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The P21/5W is an ECE-standard dual-filament bulb operating at 12V with a 21W active filament and a 5W secondary filament, mounted on a BAY15d bayonet base. Its dual-filament design allows it to serve both a primary and a reduced-intensity function within a single housing.
The 921 is an ANSI-standard single-filament wedge bulb of the T15 type, rated at 12V and 16W. It is common in North American automotive and powersports applications and uses a wedge-style base rather than a bayonet fitting.
The Ski-Doo Summit 800 Everest used the 921 bulb for the 2007 model year and transitioned to the P21/5W for the 2008-2010 model years.
The P21/5W and the 921 are not interchangeable. The BAY15d bayonet base of the P21/5W is physically incompatible with the wedge socket designed for the 921, and the two bulbs also differ in filament count and wattage.