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Shimano's gravel-oriented GRX mechanical rear derailleur come in both 1x (RX812) and 2x (RX810) configurations. We tried the RX812 in a 2x configuration with success. © A. Yee / Cyclocross Magazine

Shimano’s gravel-oriented GRX mechanical rear derailleur come in both 1x (RX812) and 2x (RX810) configurations. We tried the RX812 in a 2x configuration with success. © A. Yee / Cyclocross Magazine