SHIMANO 105-5600 2x10sp c-ring, 130BCD - 50t sil NLS Bolt Pattern: 5-BoltChain Compatibility: Shim/SRAM 10Chainring BCD: 130mmChainring BCD: 130mmChainring Speeds: 2x10spChainrings Material: AluminumComponent Color: SilverPosition: OuterTooth: 50t