Suzuki Motorcycle M90 Boulevard Turn Signal Bulb Size
Suzuki Motorcycle M90 Boulevard front turn signal bulb size P21/5W and rear turn signal bulb size P21W are specified in this replacement chart. The chart covers 2013 through 2019 model 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 Suzuki Motorcycle M90 Boulevard uses two distinct bulb types across its turn signal positions: P21/5W at the front and P21W at the rear, with this configuration remaining consistent across the 2013-2019 model years.
The P21/5W is a dual-filament bulb rated at 12V with a 21W primary filament and a 5W secondary filament, mounted on a BAY15d bayonet base. The two filaments serve separate functions within a single housing, which is why this type is commonly placed at the front where combined signalling duties are required.
The P21W is a single-filament bulb rated at 12V and 21W, using a BA15s bayonet base. Its single-filament design reflects a dedicated signalling role, consistent with its placement at the rear of the M90 Boulevard.
Both bulb types conform to ECE standards, a regulatory framework recognized across Europe and numerous other markets worldwide, governing performance and dimensional requirements for automotive and motorcycle lighting components.
The BAY15d base of the P21/5W and the BA15s base of the P21W are not interchangeable. BAY15d features offset locating pins to ensure correct dual-filament orientation, while BA15s uses a single-pin configuration suited to single-filament applications. Substituting one for the other is not physically possible without modification.
Although both bulb types share the same 21W signalling filament output, the P21/5W carries an additional 5W filament absent in the P21W. This electrical difference reinforces that the two positions on the M90 Boulevard are not served by a common bulb type.