Billet Supercharger 4" Idler Pulley Universal [Suits 3" Wide Belt]

Speedmaster's 4-inch polished idler pulley is built for supercharger systems, delivering consistent belt tension and reliable performance. Machined from durable 6061 billet aluminum and heat-treated for long-lasting strength, it features two sealed single-row ball bearings to ensure smooth operation under high loads.The pulley can be flipped to adjust spacing by 1 inch, making belt alignment straight forward when blower snout lengths change with custom supercharger setups.