Shimano GRX RD-RX812 Dealer's Manual - Page 19
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Adjustment
Adjusting the B-screw
Adjusting the B-screw
1.
Shift the chain to the smallest chainring and the largest sprocket.
Turn the crank arm in reverse.
2.
Adjust the B-screw.
Bring the guide pulley as close to the largest sprocket as possible without any turbulence
between the pulley and sprocket.
Smallest chainring
Largest sprocket
Largest sprocket
B-screw
Smallest sprocket
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B-screw
19
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