Honda Motorcycle CB1000R front turn signal bulbs measure P21/5W in size while rear turn signal bulbs measure P21W in size. The replacement chart covers 2011 through 2016 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle CB1000R uses two distinct bulb types across its front and rear turn signal positions for the 2011-2016 model years: the P21/5W at the front and the P21W at the rear.
The P21/5W is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base. The dual-filament design allows a single bulb to serve two lighting functions simultaneously.
The P21W is a single-filament bulb rated at 12V and 21W, mounted on a BA15s bayonet base. Unlike the P21/5W, it carries only one filament and is dedicated to a single lighting function.
Both bulb types conform to ECE standards, meaning they are recognized for use in Europe and other markets that follow ECE lighting regulations.
The BAY15d base of the P21/5W and the BA15s base of the P21W are not interchangeable. The BAY15d base features offset locating pins to ensure correct filament orientation, while the BA15s base has symmetrical pins suited to a single-filament design.
Because the front position requires a P21/5W and the rear requires a P21W, substituting one for the other would result in a base mismatch and incorrect fitment.
The front turn signal position of the Honda Motorcycle CB1000R holds the P21/5W across all six listed model years, 2011-2016, without variation.
The rear turn signal position holds the P21W across the same 2011-2016 span, also without variation.