Suzuki Motorcycle C90 Boulevard Turn Signal Bulb Size
Suzuki Motorcycle C90 Boulevard front and rear turn signal bulbs utilize a P21W size across all applications. The replacement chart covers 2013 to 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.
The Suzuki Motorcycle C90 Boulevard uses the P21W bulb in both the front and rear turn signal positions across the 2013-2019 model years.
The P21W is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its dedicated use in turn signal applications rather than combined stop/tail positions.
The P21W operates at 12V and 21W, a wattage rating that produces sufficient luminous output to meet signalling visibility requirements under ECE regulations.
The P21W follows the ECE standard, a specification recognized across Europe and numerous other markets worldwide, indicating broad international availability of this bulb type.
The bulb uses a BA15s bayonet base, a single-contact fitting that distinguishes it from the BA15d dual-contact variant. Substituting a BA15d bulb in a BA15s socket is not compatible due to the differing pin configurations.
Because the front and rear turn signals on the C90 Boulevard share the same P21W specification, a single bulb type covers all four turn signal positions on the vehicle.