Suzuki Motorcycle GSX-R750 Turn Signal Bulb Size

Suzuki Motorcycle GSX-R750 front and rear turn signal bulbs use a 12496 PY21W bulb size. The replacement chart covers 2011 through 2019 model 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.

Front Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2018-2019	12496	12496	Check Price
2015-2017	7507	PY21W	Check Price
2014	12496	12496	Check Price
2011-2013	7507	PY21W	Check Price

Rear Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2019	12496	12496	Check Price
2015-2018	7507	PY21W	Check Price
2014	12496	12496	Check Price
2011-2013	7507	PY21W	Check Price

Bulb Specifications

Description	Type	Shop
Philips/Osram part number. Halogen bulb, specialty application. 12V.	12496	Check Price
ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W.	PY21W	Check Price

Other Locations

Additional Notes

The two bulb types specified across all model years of the Suzuki Motorcycle GSX-R750 turn signal positions are the PY21W and the 12496. The PY21W is an ECE-standardized single-filament amber bulb rated at 12V and 21W, fitted with a BAU15s offset bayonet base. The 12496 is a Philips/Osram part number designating a 12V halogen bulb intended for specialty applications.
The BAU15s base of the PY21W uses an offset pin arrangement, which physically prevents installation of bulbs with a standard BA15s base. This base design is a deliberate fitment control, meaning standard single-filament bulbs with a symmetrical base are not interchangeable with PY21W sockets.
The PY21W is the more widely specified bulb across the GSX-R750 range. It appears in both front and rear turn signal positions across the majority of model years covered in the specifications.
The 12496 designation refers to a manufacturer-specific part number rather than a universal ECE or SAE bulb code. Its use in the GSX-R750 specifications indicates a direct OEM or OEM-equivalent replacement context rather than a broadly interchangeable standard type.
For the 2019 GSX-R750, both the front and rear turn signal positions share the same bulb type, the 12496. In the 2018 model year, the front position uses the 12496 while the rear uses the PY21W, making the two positions non-interchangeable for that year.
The 2014 GSX-R750 specifies the 12496 for both front and rear turn signal positions, placing it alongside 2019 as one of the years where both positions share the same bulb designation.
Both the PY21W and the 12496 operate on a 12V electrical system, which is consistent across all positions and model years listed in the specifications.
The amber color of the PY21W is built into the glass envelope of the bulb itself rather than produced by a colored lens. This is a characteristic of ECE-compliant amber turn signal bulbs, where the bulb must emit amber light independently of the housing.