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G-pulley/B-screw setting tool/Rear Derailleur Alignment gauge for GRX RD-RX820 RD-RX822
To adjust the B-screw of the rear derailleur RD-RX820 and RD-RX822. Set the gap between the largest pinion and the guide roller: 34 Teeth - 10mm 36 Teeth - 6mm There is an STL and a STEP version, the shape is the same.
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