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Mueller ran the new GRX GX817 Di2 rear derailleur that has a clutch like the RX805 released last year. Erica Mueller's Orbea Terra with Shimano GRX. © Z. Schuster / Cyclocross Magazine

Mueller ran the new GRX GX817 Di2 rear derailleur that has a clutch like the RX805 released last year. Erica Mueller’s Orbea Terra with Shimano GRX. © Z. Schuster / Cyclocross Magazine