Honda Motorcycle NSS300A Forza ABS Turn Signal Bulb Size
Honda Motorcycle NSS300A Forza ABS front turn signal bulb uses P21/5W size while rear turn signal bulb uses PY21W or 12496 size. The replacement chart covers 2014 through 2016 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 P21/5W is a dual-filament bulb operating at 12V with a 21W main filament and a 5W secondary filament. It uses a BAY15d bayonet base, which features two offset pins at different heights to prevent incorrect insertion.
The PY21W is a single-filament amber bulb rated at 12V and 21W. It uses a BAU15s bayonet base, which has asymmetrically positioned pins that differ from the BAY15d base used by the P21/5W, making the two types physically non-interchangeable.
The Honda Motorcycle NSS300A Forza ABS uses a P21/5W bulb for the front turn signals across the 2014-2016 model years.
The rear turn signal specification changes between model years. The 2014-2015 models use a 12496 bulb, while the 2016 model uses a PY21W.
The 12496 is a part number assigned by manufacturers such as Philips and Osram rather than an ECE standard designation. It is rated at 12V and classified as a specialty halogen application.
Because the P21/5W and PY21W share the same 21W power rating but differ in base type and filament count, one cannot substitute for the other despite the superficial similarity in wattage.
The P21/5W and PY21W are both governed by ECE regulations, which are applied across European and worldwide markets, indicating these bulb types conform to internationally recognized signaling standards.