Honda Motorcycle VTX1800F front and rear turn signal bulbs use a 12496 or PY21W bulb size. The replacement chart covers 2005 through 2008 model 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 VTX1800F uses two distinct bulb types across its turn signal positions: the 12496 and the PY21W. Both operate at 12V, making them compatible with the motorcycle's standard electrical system.
The 12496 is a Philips/Osram part number designating a halogen bulb intended for specialty automotive applications. It is rated at 12V and appears in both front and rear turn signal positions across multiple model years of the VTX1800F.
The PY21W is an ECE-standard bulb common in European and worldwide markets. It features a single filament, produces amber light, and uses a BAU15s bayonet base. It is rated at 12V and 21W.
The BAU15s base of the PY21W is an offset-pin bayonet fitting. The offset pin placement prevents the bulb from being seated in a socket designed for a standard BA15s base, meaning PY21W and similarly based bulbs are not freely interchangeable with straight-pin bayonet types.
The front turn signal position on the VTX1800F used the 12496 in 2005, 2007, and 2008, while the 2006 model year used the PY21W instead. This indicates a mid-cycle change in front turn signal bulb specification.
The rear turn signal position on the VTX1800F shows a similar pattern of variation. The 2005 and 2007 model years used the 12496, while the 2006 and 2008 model years used the PY21W.
In the 2007 model year, both the front and rear turn signal positions share the same bulb type, the 12496. The 2006 model year similarly uses the same type, the PY21W, in both positions.
The 2005 and 2008 model years do not share a uniform bulb type across front and rear positions. In 2005, both positions use the 12496, while in 2008, the front uses the 12496 and the rear uses the PY21W.
Because the 12496 and PY21W differ in base design and potentially in physical construction, substituting one for the other without confirming socket compatibility with the specific model year is not supported by these specifications.