Honda Motorcycle CB900F Super Sport Turn Signal Bulb Size
Honda Motorcycle CB900F Super Sport front turn signal bulbs measure 1034 in size while rear turn signal bulbs measure P21W in size. The replacement chart contains bulb size specifications covering 1981 to 1982 vehicle production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle CB900F Super Sport uses two distinct bulb types across its front and rear turn signal positions, with the 1034 fitted at the front and the P21W fitted at the rear for both the 1981 and 1982 model years.
The 1034 bulb follows the ANSI standard, making it the designated specification for markets in the United States and Canada.
The P21W bulb follows the ECE standard, which governs lighting equipment across Europe and a broad range of international markets.
The 1034 is a dual-filament bulb rated at 12V and 21/5W, meaning it carries one filament for the higher-intensity 21W function and a second for the lower-intensity 5W function.
The P21W is a single-filament bulb rated at 12V and 21W, dedicated solely to signalling without a secondary filament for parking or running light functions.
The 1034 uses a BAY15d bayonet base, which is an offset twin-pin fitting. This offset pin arrangement prevents incorrect insertion by ensuring only one rotational orientation is physically possible.
The P21W uses a BA15s bayonet base, which is a single-pin fitting. The BA15s base is not interchangeable with the BAY15d base used by the 1034, as the pin configurations differ.
The 1034 is described as a variant of the 1157 bulb. The 1157 is a widely used dual-filament automotive bulb, and the 1034 shares its BAY15d base and dual-filament design while operating at the same 12V, 21/5W rating.