Ski-Doo Summit Sport 600 Carb Brake Bulb Size

The Ski-Doo Summit Sport 600 Carb uses a P21/5W bulb for the brake component. Available data for the specified equipment covers the period from 2012 through 2019.

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
2012-2019	1157	P21/5W	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

Other Locations

Additional Notes

The P21/5W is the brake bulb used across all listed model years of the Ski-Doo Summit Sport 600 Carb, spanning 2012-2019.
The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The higher-output filament operates at 21 watts and the lower at 5 watts, allowing one bulb to serve both a steady illumination function and a brighter signalling function.
The P21/5W operates on a 12-volt electrical system, which is standard for powersport applications.
The bulb uses a BAY15d bayonet base. The BAY15d designation indicates an offset double-contact base, where the two pins are positioned at different heights. This offset is a deliberate anti-misinstallation feature that prevents the bulb from being seated in the wrong orientation, which would reverse the two filaments.
The P21/5W conforms to ECE (Economic Commission for Europe) standards, a regulatory framework recognized across Europe and numerous other markets worldwide.
Because the BAY15d base uses offset pins, it is not interchangeable with the BA15d base, which has pins at equal heights. Substituting a BA15d bulb in a BAY15d socket is not possible without forcing the fitment, and doing so would result in incorrect filament assignment.
The P21/5W should not be confused with the P21W, which is a single-filament bulb sharing a similar appearance but lacking the secondary 5-watt filament and using a BA15s single-contact base rather than the BAY15d dual-contact base.