Serpent SER903721 S989 Side Pulley Pair - Replacement Kit  [SER903721]

Keep Your S989 Running Smooth

The Serpent SER903721 side pulley pair is produced for the S989 to provide reliable rotation and reduce drivetrain chatter. These two pulleys are a straightforward replacement to help your car retain consistent handling across varied surfaces.

Where They Work Best

Designed around the S989 geometry, the pulleys maintain correct spacing and support efficient torque flow. They make a practical swap when original parts show wear or when preparing a car for race day to ensure predictable power delivery.

Setting Up and Servicing

When installing the Serpent SER903721 pulleys, verify shafts and fasteners are clean and torque to spec. Routine inspections and keeping contaminants away will help the pulleys deliver long service life.