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Modified Shimano GRX RD-RX812 1x11 spd rear derailleur to supports 2x11 spd w/ 11-46T cassette. - YouTube
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Shimano GRX RX810 & RX812 Hydraulic Flat Mount STI 1 Ring Crankset Wide Range Casette Groupset | Texas Cyclesport
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Amazon.com: Shimano GRX RD-RX812 Rear Derailleur - 11-Speed, Long Cage, Black, With Clutch, For 1x : Everything Else
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