The Yamaha XP500 TMAX front turn signal bulb measures P21/5W while the rear turn signal bulb measures PY21W in size. The replacement chart covers 2015 to 2016 production 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 Yamaha XP500 TMAX uses two distinct bulb types across its front and rear turn signal positions for the 2015-2016 model years: the P21/5W at the front and the PY21W at the rear.
The P21/5W is a dual-filament bulb, meaning it carries two separate filaments within a single envelope, rated at 12V with a 21W primary filament and a 5W secondary filament.
The P21/5W uses a BAY15d bayonet base, a two-pin offset base where the two pins are positioned at different heights to prevent incorrect installation.
The PY21W is a single-filament amber bulb rated at 12V and 21W, with the amber coloring built into the glass rather than relying on a colored lens to produce the required signal hue.
The PY21W uses a BAU15s bayonet base, which features a single offset pin. This base is physically distinct from the BAY15d used by the P21/5W, making the two bulbs non-interchangeable despite their similar appearance.
Both the P21/5W and PY21W conform to ECE (United Nations Economic Commission for Europe) standards, indicating their design and output meet regulations applied across Europe and numerous other markets worldwide.
Because the front P21/5W is a dual-filament bulb, it is capable of serving more than one lighting function simultaneously, a characteristic that distinguishes it from the single-filament PY21W used at the rear.
The offset pin configurations of the BAY15d and BAU15s bases serve as a mechanical interchangeability safeguard, as substituting one base type for the other in the same socket is not physically possible without modification.