https://www.rei.com/product/C11243/shimano-alfine-fc-s501-1x-chainring
Shimano Alfine FC-S501 1x Chainring | REI Co-op
Set your ride up with this Shimano chainring. It's designed for use with Alfine S501 1x cranksets. It has 45 teeth and Bolt Circle Diameter of 130 mm.
shimano alfine1x chainringfcreico