Retain optimal chain tension and a smooth riding experience with the Shimano Alfine Chain Tensioner. This high-quality tensioner is designed to ensure your chain stays in place and performs at its best. The Shimano Alfine Chain Tensioner also features washers on the mounting bolt, allowing for 5mm of chainline adjustability to fine-tune your setup. Specifically designed for use with a 3/32" chain. This is a direct replacement for a Biktrix Moto