SHIMANO FC-6603 Ultegra 3x10sp chainring, 130BCD - 39t sil Bolt Pattern: 5-BoltChain Compatibility: Shim/SRAM 10Chainring BCD: 130mmChainring BCD: 130mmChainring Speeds: 3x10spChainrings Material: AluminumComponent Color: SilverPosition: MiddleTooth: 39t