Honda Motorcycle NPS50 Ruckus Turn Signal Bulb Size
Honda Motorcycle NPS50 Ruckus front and rear turn signal bulbs use a 1073 size with P21W specification. The replacement chart covers 2003 to 2020 production years with bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The two bulb types specified across the Honda Motorcycle NPS50 Ruckus turn signal positions are the 1073 and the P21W. Both share a BA15s bayonet base, making them physically similar in mounting style despite originating from different standardization systems.
The 1073 follows the ANSI standard used in the United States and Canada, while the P21W follows the ECE standard adopted in Europe and much of the rest of the world. The presence of both types across model years of the same vehicle reflects regional or sourcing variations in original equipment.
Although the 1073 and P21W share the same BA15s base, their wattage ratings differ. The 1073 operates at 12V and 13W, whereas the P21W operates at 12V and 21W. This difference means the two bulbs are not electrically interchangeable without potential consequences for turn signal flash rate or circuit load.
Both bulb types are single-filament designs, which is consistent with their use in dedicated turn signal applications rather than combined stop and turn functions.
The 1073 is described as a lower wattage variant of the 1156, a widely used ANSI automotive bulb. It shares the same BA15s base as the 1156 but draws less power, which is a relevant distinction when sourcing replacements.
For the front turn signal on the Honda Motorcycle NPS50 Ruckus, the 1073 is specified for 2018-2020, while the P21W is specified for the majority of other years. The year 2013 also calls for the 1073 at the front position, and 2005 similarly specifies the 1073, making those years exceptions within an otherwise P21W-dominant front fitment history.
The rear turn signal position shows a different pattern from the front. The 1073 appears at the rear only for 2018-2020 and 2008, while the P21W is specified for all other listed years including 2013, which differs from the front signal specification for that same year.
The front and rear turn signal bulb sizes do not always match within the same model year. In 2013, the front specifies a 1073 while the rear specifies a P21W, and in 2008, the rear specifies a 1073 while the front specifies a P21W. Owners of those model years would require two different bulb types to service both signal positions.