Can-Am Spyder RT Back Up Light Bulb Size

The Can-Am Spyder RT back up light uses a P21W bulb size for replacement purposes. The replacement chart covers 2010 through 2019 vehicle production years with corresponding bulb size 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
2010-2019	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The Can-Am Spyder RT uses the P21W bulb for its back up light across the 2010-2019 model years.
The P21W is an ECE-standard bulb, meaning it conforms to the Economic Commission for Europe's regulations, which govern lighting equipment used in Europe and many other markets worldwide.
P21W bulbs operate on a 12-volt electrical system and draw 21 watts, which is typical for single-filament signalling applications.
The P21W uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin offset to one side, distinguishing it from dual-contact bayonet variants.
Because the BA15s base is single-contact, the P21W is not interchangeable with visually similar bulbs that use a BA15d (dual-contact) base, even though the physical housing size may be comparable.
The single-filament design of the P21W means it serves one dedicated function per socket, which in this application is the reverse light circuit of the Can-Am Spyder RT.