Honda Motorcycle CBR250R front and rear turn signal bulbs use 12496 and PY21W bulb sizes respectively. The replacement chart covers 2011 to 2013 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 CBR250R uses the 12496 bulb across all listed model years (2011-2013) for the front turn signal position.
The 12496 is a halogen bulb operating at 12V, designated under Philips and Osram part numbering systems as a specialty application bulb.
The rear turn signal on the CBR250R lists two bulb sizes for certain years: both the 12496 and the PY21W appear in the 2011 and 2013 rear turn signal entries, indicating variant fitments exist within those model years.
The PY21W is an ECE-standard bulb, meaning it conforms to European and international automotive lighting regulations, and it produces amber light natively through its tinted glass envelope rather than through a clear bulb in an amber housing.
The PY21W operates at 12V with a 21W output and uses a BAU15s bayonet base, which is an offset-pin base specifically designed to prevent incorrect installation of non-amber bulbs in amber-designated sockets.
The BAU15s base on the PY21W is not interchangeable with the more common BA15s base found on standard single-filament bulbs, making socket compatibility a relevant fitment consideration for the CBR250R rear turn signal.
The 12496 and PY21W are not cross-compatible replacements for one another due to differing base types and construction standards, meaning the correct replacement depends on which variant the specific motorcycle was built with.