R10 12V Tail Light Bulb

R10 12V Tail Light Bulb

💡 R10 Bulb · P21W · 12V 21W · Scooter Tail Light

12V P21W Tail Light Bulb · For 50cc, 150cc & 250cc Street Scooters · Single-Contact Base Design

This is the R10 12V Tail Light Bulb (also known as P21W bulb), a widely used tail light bulb specification for various street scooters. It is suitable for 50cc, 150cc, and up to 250cc displacement scooters, making it an ideal replacement for the original tail light and brake light bulbs.

The P21W bulb (type R10, BA15s, or single-contact bulb) is one of the most common tail light bulb specifications for motorcycles and scooters, featuring a single-contact, single-bayonet base design for simple installation and reliable operation. Manufactured with high-quality halogen or krypton gas filament, this bulb delivers 21W power consumption at 12V operating voltage with excellent luminous efficiency and long service life. This is the perfect replacement when the original tail light bulb burns out, shows reduced brightness, or has a broken filament.

This P21W tail light bulb is compatible with the following vehicles and lighting systems:

• Vehicle Types: Street scooters, mopeds, ATVs (All-Terrain Vehicles), dirt bikes, go-karts
• Displacement Range: 50cc, 125cc, 150cc, 200cc, 250cc, and other displacements
• Socket Specification: Standard BA15s single-contact, single-bayonet socket (P21W / R10 specification)
• Voltage Requirement: 12V DC electrical system
• Common Models: GY6 series scooters, Honda Cub series, Yamaha, Kymco, SYM, and other scooter brands

• P21W Standard Specification: International standard P21W specification (R10) with single-contact, single-bayonet base, widely compatible with various scooters.
• 12V 21W Power Rating: Standard power configuration with adequate brightness — the most common specification for scooter tail lights.
• High-Quality Filament: Premium tungsten filament with halogen/krypton gas fill for excellent luminous efficiency and long service life.
• Heat-Resistant Glass: High-temperature glass tube with excellent thermal shock resistance and durability.
• Plug-and-Play: Direct replacement for original bulb with no modifications required — simple installation.
• Wide Application: Suitable for 50cc to 250cc street scooters, one of the most common replacement specifications on the market.

🔧 Installation Guide

1. Ensure the vehicle is off and the tail light switch is off before installation to prevent burns or short circuits.
2. Remove the tail light lens or access the bulb socket from the rear of the vehicle.
3. Remove the old bulb (P21W bulbs are typically secured with a push-and-twist mechanism).
4. Important: When installing the new bulb, do not touch the glass surface with bare hands (skin oils can cause hot spots and reduce bulb life).
5. Insert the new bulb into the socket, aligning the base locating pins with the socket grooves, then push and twist to secure.
6. Reinstall the tail light lens, ensuring proper sealing to prevent moisture ingress.
7. Turn on the tail light switch to test illumination; press the brake pedal to test brake light function.
8. If the tail light does not illuminate after replacement, check the fuse and wiring connections.

⚠️ Important Notice: This product is the R10 12V Tail Light Bulb (P21W specification) with standard single-contact, single-bayonet base, suitable for 50cc, 150cc, and up to 250cc street scooters.
Spec Confirmation: Before purchasing, verify your vehicle's tail light socket is the BA15s single-contact type (P21W / R10 specification) and the electrical system is 12V.
Installation Caution: Do not touch the glass surface of the bulb with bare hands during installation, as skin oils can cause overheating and premature bulb failure. Turn off the power before replacement to prevent burns. If the tail light does not illuminate after replacement, check the fuse and wiring. Product images are for reference only; please refer to the actual product.