Honda Motorcycle CHF50 Metropolitan Turn Signal Bulb Size
Honda Motorcycle CHF50 Metropolitan front and rear turn signal bulbs use P21W size. The replacement chart covers 2002 to 2009 model years with bulb specifications for this vehicle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle CHF50 Metropolitan uses the P21W bulb type for both its front and rear turn signals across all documented model years from 2002-2009.
The P21W is an ECE-standard bulb, meaning it conforms to the Economic Commission for Europe's regulations, which are widely adopted across European and international automotive markets.
The P21W operates at 12 volts and 21 watts, which is a standard rating for single-filament turn signal applications in motorcycles and other small vehicles.
The P21W uses a BA15s bayonet base, where "BA" denotes a bayonet cap fitting, "15" refers to the 15mm base width, and the lowercase "s" indicates a single contact at the base, distinguishing it from dual-contact variants.
Because the P21W is single-filament, it serves one dedicated function per housing, which is consistent with its use in turn signal positions rather than combined stop/tail applications.
The front and rear turn signal positions on the CHF50 Metropolitan share the same P21W specification, meaning a single bulb type covers all four turn signal housings on the vehicle.
The BA15s bayonet base is not interchangeable with the BA15d base, which carries two offset contact pins at the bottom. Substituting a dual-contact bulb in a single-contact socket is not compatible.
The uniform P21W fitment across the 2002-2009 model range indicates that replacement bulbs sourced for any year within that span are cross-compatible with all other years of the same model.