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GOD & FAMOUS Grandpa 5 Panel Nylon Hat Black Road Gravel Groupset The RD RX812 rear derailleur is The RD RX812 rear derailleur is compatible with mtb cassettes with a 42T low sprocket max MODEL NO SM EW90 A SERIES DURA ACE 9070 Series Average weight 10 E tube connector (QTY) 0 E tube port (QTY) 3 Charging port (pcs) 1 Firmware update by E TUBE PROJECT ✔ Compatible electric wire EW SD50 Compatible system E TUBE Connector for remote sprinter shifter (QTY) 0 Firmware update by E TUBE Project ✔ Function_Adjust mode display ✔ Function_DI2 Battery level ✔ Function_E TUBE connection ✔ Function_Gear position ✔ Port for remote sprinter shifter (QTY) 0 Position Under stem Type External type Type External type Compatible system E TUBE Compatible electric wire EW SD50 Position Under stem SD300 connector (pcs) 0 SD300 port (pcs) 0 SD50 connector (pcs) 0 SD50 port (pcs) 3