Shimano GRX RD-RX810 Dealer's Manual - Page 12
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Adjustment
Checking the chain length
2.
Check the length of the chain.
Add 4 - 6 links to set the length of the chain as shown in the figure.
If the inner links and outer links match when mounting the chain
Add 4 or 6 links to set the length.
When setting the chain length with 4 links added, if you are concerned about turbulence
in the drivetrain components when the chain is on the largest sprocket and largest
chainring, set the chain length with 6 links added.
Inner link
Outer link
+4 links or +6 links
If the inner links match together and the outer links match together
Add 5 links to set the length.
+5 links
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