Shimano GRX RD-RX812 Dealer's Manual - Page 13

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Adjustment

Checking the chain length

NOTICE

• The rear derailleur plate assembly is equipped with a pin or plate that prevents

chain derailment. When passing the chain through the rear derailleur, pass it

through the main body of the rear derailleur from the side of the chain

derailment prevention plate as shown in the figure.

• If the chain is not passed through the correct position, damage may be caused to

the chain or the rear derailleur.

RD-RX810

RD-RX812/RD-RX400

Chain derailment prevention

plate

Chain derailment prevention

plate