Wolf Tooth makes excellent components and solutions for riders who want a little extra out of their bikes. The GC 40 and GC 42 are giant cogs that give riders extra large gearing so they can climb tougher hills. However, when you use these cogs, you might start running into compatibility issues. When using the GC 42 or GC 40 with a Shimano rear derailleur, a longer B-screw may be needed. This is a high quality, 18-8 stainless steel M4 x 25 mm screw.
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Some manufacturers restrict where we can ship their products. If this item has shipping restrictions, they are listed below. If you'd like to buy an item that we cannot ship to your preferred address, we can accept your foreign credit card and ship to a USA address for you.
Get free 1-day California shipping with your $50 purchase today, on most orders. Please note this offer is only available to physical shipping addresses in California(no PO Boxes), and oversize charges still apply on some heavy/large items