SHIMANO Ultegra FC-6500 42 Tooth 9-Speed A-type Chainring Bolt Pattern: 5-BoltChain Compatibility: 9-SpeedChainring BCD: 130mmChainring BCD: 130mmChainring Speeds: 9spChainrings Material: AluminumComponent Color: SilverPosition: InnerTooth: 42t(A)