Shimano GRX RD-RX400 Dealer's Manual - Page 11
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Adjustment
Adjusting the stroke on the high limit
Adjustment
Adjusting the stroke on the high limit
1.
Adjust by turning the high limit screw.
Adjust so that the center of the guide pulley is aligned with the outer face of the smallest
sprocket when viewed from the rear side.
Installing the chain
Refer to the dealer's manual for the chain to find instructions on installing/removing the chain.
Checking the chain length
1.
Mount the chain on the largest sprocket and the largest chainring.
Largest sprocket
High limit screw
*
Smallest sprocket
Guide pulley
*
High limit screw
RD-RX810/
RD-RX812
RD-RX400
Chain
Largest chainring
11