Honda Motorcycle CBR125R front and rear turn signal bulbs use PY21W size, designated as 12496. The replacement chart covers 2004 through 2011 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 Honda Motorcycle CBR125R turn signal system uses two bulb types across its model years: PY21W and 12496, both rated at 12 volts.
The PY21W is an ECE-standard amber single-filament bulb operating at 12V and 21W, fitted with a BAU15s bayonet base. The angled base pins of the BAU15s socket distinguish it from the more common BA15s straight-pin base, making the two physically non-interchangeable.
The 12496 is a Philips/Osram part number designating a 12V halogen bulb for specialty applications. It serves as the turn signal bulb in place of the PY21W on certain CBR125R model years.
For the front turn signal, the Honda Motorcycle CBR125R uses the PY21W in 2004-2005, 2007-2008, and 2011, while the 12496 appears in 2006 and 2009.
The rear turn signal fitment differs from the front on several model years. The 12496 is specified for the rear in 2004, 2006-2007, and 2009, whereas the PY21W covers 2005, 2008, and 2011.
In 2007, the front and rear turn signals on the CBR125R use different bulb types: the front takes a PY21W while the rear takes a 12496. Substituting one for the other without confirming socket compatibility would result in an incorrect fitment.
In 2005 and 2008, both the front and rear turn signals share the same PY21W specification, meaning a single bulb type covers all four turn signal positions in those years.
In 2006 and 2009, both the front and rear turn signals share the 12496 specification across all four positions.
Because the PY21W and 12496 are distinct part numbers with different base and application classifications, they are not confirmed as interchangeable, and the year-specific fitment data reflects that distinction across the CBR125R model range.
The PY21W designation is governed by ECE regulations and is widely used in European and international markets, which aligns with the CBR125R's primary market positioning outside North America.