Honda Motorcycle VF1000R front turn signal bulbs measure 1034 in size, while rear turn signal bulbs measure P21W, with these specifications representing the unique bulb sizes for this model. The replacement chart covers 1985 to 1986 production years and contains bulb size specifications for turn signal applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle VF1000R uses two distinct bulb types across its turn signal positions: the 1034 at the front and the P21W at the rear, across both the 1985-1986 model years.
The 1034 is an ANSI-standard bulb used in the United States and Canada. It operates at 12V with a dual-filament output rated at 21/5W, and it mounts via a BAY15d bayonet base.
The dual-filament design of the 1034 means it carries two separate circuits within a single bulb, typically serving both a brighter function and a dimmer standby or running function at different wattages.
The 1034 is a variant of the 1157, a widely referenced automotive bulb. Despite this relationship, the two are not always interchangeable, as minor differences in base pin spacing or filament positioning can affect fitment and function.
The P21W follows the ECE standard, which governs lighting regulations across Europe and much of the wider international market. It operates at 12V with a single-filament output rated at 21W, mounted on a BA15s bayonet base.
The BA15s base of the P21W is a single-contact bayonet fitting, distinct from the dual-contact BAY15d base of the 1034. These two base types are not interchangeable despite sharing a similar 15mm collar size.
The regional split between the 1034 and P21W reflects differing lighting standards between North American and international markets, with the VF1000R front and rear positions each assigned a bulb suited to its respective regulatory context.
The single-filament construction of the P21W means it serves one function only, consistent with its role as a dedicated turn signal bulb rather than a combined signal and running light.