Honda Motorcycle CB300F front and rear turn signal bulbs use a 12496 PY21W bulb size. The replacement chart covers 2015 to 2018 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle CB300F turn signal specifications reference two bulb types across its 2015-2018 model years: 12496 and PY21W.
The PY21W is an ECE-standard single-filament amber bulb rated at 12V and 21W, fitted with a BAU15s bayonet base. The BAU15s base uses offset pins to prevent incorrect installation of non-amber bulbs in amber-designated sockets.
The 12496 is a Philips/Osram part number designating a 12V halogen bulb for specialty applications, rather than a universal industry-standard code.
The front turn signal on the Honda Motorcycle CB300F uses the 12496 in 2015 and 2018, and the PY21W in 2016-2017, indicating the front position does not use a single bulb type across all four model years.
The rear turn signal follows a reversed pattern, using the PY21W in 2015-2016 and the 12496 in 2017-2018.
In the 2016 model year, the front and rear turn signals use different bulb types from each other, with the front taking the PY21W and the rear taking the PY21W as well, while the 2017 model year splits them, with the front using PY21W and the rear using 12496.
Because the 12496 and PY21W carry different base types and wattage ratings, they are not interchangeable with each other, and substituting one for the other in a given socket is not supported by these specifications.
Both bulb types operate on a 12V electrical system, which is consistent with standard motorcycle electrical architecture.