Ducati ST4 Brake Bulb Size
The Ducati ST4 brake bulb uses a P21/5W size bulb for the brake light application. The replacement chart covers 1999 to 2005 model 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.
Bulb Size by Year Range
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 1999-2005 | 1157 | P21/5W | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W. | P21/5W | Check Price |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W. | 1157 | Check Price |