Honda Motorcycle CBF1000A front and rear turn signal bulbs use a 12496 or PY21W size. The replacement chart covers 2006 to 2010 production years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle CBF1000A uses two distinct bulb types across its turn signal positions: the PY21W, an ECE-standardized amber single-filament bulb, and the 12496, a Philips/Osram halogen part number designated for specialty applications.
The PY21W is the more frequently specified bulb across both front and rear turn signal positions on the CBF1000A, appearing in the majority of model years covered by the specifications.
The PY21W operates at 12V with a 21W output and uses a BAU15s bayonet base. The BAU15s base features an offset pin configuration, which physically prevents substitution with standard BA15s-based bulbs.
The 12496 is a manufacturer-specific part number used by Philips and Osram rather than an ECE designation. It operates at 12V and falls within the halogen specialty category.
For the front turn signal, the 2006-2009 model years specify the PY21W, while the 2010 model year specifies the 12496.
For the rear turn signal, the 2006-2007 and 2009-2010 model years specify the PY21W, while the 2008 model year specifies the 12496.
The front and rear turn signal positions do not always share the same bulb type within a given model year. In 2010, the front position takes the 12496 while the rear takes the PY21W, and in 2008, the rear position takes the 12496 while the front takes the PY21W.
Because the 12496 and PY21W carry different designations, one being a proprietary part number and the other an ECE standard, direct interchangeability between the two cannot be assumed without confirming that their base type, wattage, and voltage ratings align with the socket requirements of the specific position and year.