Box Three & Four Derailleur B-Screw with Plastic Insert - Box®

Box Three & Four Derailleur B-Screw with Plastic Insert

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Only 1 left in stock

SKUSP10-BX3/4-BSCREWINSERT

Replacement b-screw kit for early model Box Three and Four rear Derailleurs.

Includes:
(1) B-screw
(1) Plastic expansion insert

Box three serial numbers 20390000 and lower
Box Four serial numbers 20380000 and lower

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