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. Â A longer b-screw is almost always needed when using the GC42 with a Shimano rear derailleur. Â Â
Features:
- M4 x 24mm screw for that extra little push
This product was added to our catalog on August 29, 2017










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