Honda Motorcycle Monkey front and rear turn signal bulbs both utilize a P21W bulb size for optimal lighting performance. The replacement chart covers 2019 to 2020 model 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.
The P21W is the sole bulb type specified for the Honda Motorcycle Monkey across all listed positions and model years, covering both front and rear turn signals for the 2019-2020 model years.
The P21W operates at 12 volts with a 21-watt output, classifying it as a single-filament incandescent bulb intended for signalling functions such as turn indicators.
The P21W uses a BA15s bayonet base, which is a single-contact bayonet fitting with a 15mm collar. The "s" designation indicates a single contact point at the base, distinguishing it from dual-contact variants.
Because the BA15s base has only one contact, the P21W is not interchangeable with visually similar bulbs that use a BA15d (dual-contact) base, even though the physical collar size is the same.
The P21W is governed by ECE regulations, a standard recognized across Europe and numerous other markets worldwide, meaning the bulb conforms to internationally defined output and performance criteria for vehicle signalling.
The front and rear turn signal positions on the Honda Motorcycle Monkey share an identical bulb specification for both 2019 and 2020, meaning a single bulb type serves all four turn signal sockets on the vehicle.