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Looking to get a little extra distance so that your derailleur clears your 40 or 42 tooth cog? Look no further. When using the GC 40 with a Shimano rear derailleur, a longer B-screw may be needed. A longer b-screw is almost always needed when using the GC42 with a Shimano rear derailleur.
This product was added to our catalog on August 29, 2017