8 Rib 48mm Serpentine Pulley
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Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
Swap to the right belt geometry with the 8 Rib 48mm Serpentine Pulley.
Specifications
| Type | Serpentine alternator pulley |
|---|---|
| Ribs | 8 |
| Diameter | 48 mm |
Product Overview
An 8-rib 48mm pulley for high-output alternator builds. Pulley diameter directly sets alternator shaft speed for a given engine RPM — a smaller pulley spins the alternator faster and brings more output in at idle, which is the whole point in a car audio or competition build.
Changing pulley diameter changes your belt length requirement. Measure and order the correct belt for the new geometry rather than assuming your existing one will still fit.
Not sure which pulley your setup needs? Tell us your alternator model and what you are trying to achieve at idle and we will help you get it right.
Questions about fitment or what this pairs with? Reach out to JS Ultimate Sounds before you buy — we'll point you the right way.
