Kraftwerks R50-99-0105 Rotrex Supercharger Pulley 105mm 8 Rib

The Kraftwerks R50-99-0105 is a factory replacement supercharger pulley designed specifically for Rotrex centrifugal supercharger systems. This precision-engineered 105mm diameter steel pulley features an 8-rib serpentine belt design (8PK) that mounts directly to the input shaft of compatible Rotrex superchargers.

Key Features:

• 105mm diameter for precise boost control and tuning
• 8-rib (8PK) serpentine belt configuration
• Factory Rotrex steel construction for durability
• Direct bolt-on replacement with 6-bolt mounting pattern
• Enables supercharger speed and boost level adjustments

Rotrex supercharger pulleys are essential tuning components that control boost output by adjusting the drive ratio between the crankshaft and supercharger. Smaller pulleys increase supercharger speed and boost pressure, while larger pulleys reduce both. The 105mm size provides a balanced setup suitable for street applications where moderate boost levels are desired. When changing pulley sizes, always verify that maximum supercharger RPM limits are not exceeded at engine redline using Rotrex's pulley calculator tools.

This pulley is compatible with Kraftwerks supercharger systems utilizing Rotrex centrifugal superchargers with 8-rib belt configurations. Professional installation and proper belt tension are critical for reliable operation and optimal performance.