DMS 50mm Supercharger Idler Pulley

DMS 50mm Supercharger Idler Pulley – High RPM Billet Design for LS9 & LSA Systems

Precision-engineered for high-performance supercharged setups

While 50mm idler pulleys are often considered less ideal due to the stress high RPMs place on bearings, certain builds require them to achieve proper belt routing and tension. The DMS 50mm Supercharger Idler Pulley is the reliable solution for demanding LS9 and LSA applications — including 2009–2013 ZR1 Corvettes and LSA supercharged builds using oversized crank pulleys.

Other brands have failed under these conditions, but we engineered this pulley to outlast and outperform the rest. Built with dual high-RPM NTN bearings rated to 45,000+ RPM, and featuring a one-piece Spirolox retainer for superior balance and durability. Machined from 6061 billet aluminum, anodized black for corrosion resistance, and designed for factory bolt compatibility with included bearing spacers.

Key Features:

• High-performance 50mm idler pulley for LS9 and LSA supercharged engines

• 42mm wide to support belts up to 11 ribs

• Compatible with OEM offset for LS9/LSA belt drive systems

• Assembled with dual NTN high-speed bearings

• Spirolox retainer for long-term balance & durability

• CNC machined from 6061 billet aluminum

• Anodized black finish

• Designed to handle high RPM use and belt tension loads