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S-25 BAY15D Brake Bulb 12V 21/5W for Motorcycle, ATV & Scooter
S-25 BAY15D Brake Bulb 12V 21/5W for Motorcycle, ATV & Scooter
5.0 / 5.0
(3) 3 total reviews
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Product Overview
This S-25 BAY15D 12V 21/5W brake bulb is designed for motorcycles, ATVs, scooters, dirt bikes, and go karts using a BAY15D dual-contact socket.
It provides clear, reliable illumination for tail and brake light functions, helping improve visibility and reaction time during night riding and braking.
With a reinforced filament structure and optimized gas mixture, this bulb delivers stable light output, dependable performance, and long service life for everyday riding.
Product Compatibility
| Vehicle Type | Fitment |
|---|---|
| Motorcycle | BAY15D brake light socket |
| Scooter | 12V systems |
| ATV / Quad | Brake & tail light use |
| Dirt Bike | Small displacement models |
| Go Kart | BAY15D light housing |
Note:
Please carefully check bulb type (S-25 BAY15D), dimensions, and socket style before ordering.
Specifications
| Item | Details |
|---|---|
| Bulb Type | S-25 BAY15D Brake Bulb |
| Voltage | 12V |
| Power | 21W / 5W |
| Light Function | Brake Light / Tail Light |
| Installation Diameter | 15mm / 0.59" |
| Bulb Length | 48mm / 1.88" |
| Light Source | Halogen |
| Base Type | BAY15D (Dual Contact) |
| Application | Motorcycle, ATV, Scooter, Go Kart |
| Package Includes | 1 × Brake Bulb |
Key Features
- S-25 BAY15D bulb for brake and tail light applications
- 21/5W dual-intensity output for clear signaling
- Extended light beam improves rider reaction time
- Reinforced filament design resists vibration
- Optimized gas mixture for stable brightness and long lifespan
- Direct replacement with easy installation
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for Vehicle Type; Motorcycle; BAY15D brake light socket; Scooter; 12V systems; ATV / Quad; Brake & tail light use. Key physical/spec details from the product data include Voltage: 12V, Installation Diameter: 15mm / 0.59", Bulb Length: 48mm / 1.88". Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this replacement part, also compare the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. This is especially important for S-25/BAY15D models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this replacement part for machines outside the listed compatibility, or for units with different OEM numbers, dimensions, mounting points, connectors, or year-specific configurations. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. Recheck listed specs such as Voltage: 12V, Installation Diameter: 15mm / 0.59", Bulb Length: 48mm / 1.88". If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
It fits my scooter
The bulb works
worked and now my tail light works.