Shimano Alfine FC-S500 9-speed Chainring for Double Chain Guard

The Shimano Alfine 9-speed Chainring for the FC-S500 crankThis Shimano 9-speed chainring is designed for the Alfine FC-S500 crank with chain guard on both sides. It is made of aluminium and has a 130 bolt circle diameter. The 39-tooth version also fits the