Honda Motorcycle CMX500 Rebel 500 Turn Signal Bulb Size
Honda Motorcycle CMX500 Rebel 500 front turn signal bulbs use P21/5W size while rear turn signal bulbs use P21W size. The replacement chart covers 2017 to 2019 production 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 CMX500 Rebel 500 uses two distinct bulb types across its turn signal positions: the P21/5W at the front and the P21W at the rear, across the 2017-2019 model years.
Both the P21/5W and P21W are ECE-standard bulbs, a specification recognized across Europe and worldwide markets.
The P21/5W is a dual-filament bulb, meaning it carries two separate filaments within a single housing, rated at 12V with a 21W primary filament and a 5W secondary filament.
The P21W is a single-filament bulb rated at 12V and 21W, serving a dedicated signalling function without a secondary filament.
The front turn signal position on the CMX500 Rebel 500 uses the P21/5W, which features a BAY15d bayonet base. This base type is offset-pin, meaning its two mounting pins are positioned at different heights to prevent incorrect installation.
The rear turn signal position uses the P21W, which features a BA15s bayonet base. This is a single-contact base with two pins at the same height, distinguishing it physically from the BAY15d used at the front.
Because the front P21/5W uses a BAY15d base and the rear P21W uses a BA15s base, the two bulb types are not interchangeable with each other despite sharing the same 21W primary wattage rating.