The GC42 cassette cog is so big that when machining the first batch, the machinist thought he made a mistake! If being big is cool then the GC42 is the coolest cog around. This cog is made with the precision and finish that Wolf Tooth Components customers have come to expect, and this enables quite possibly the best feeling shift in the cassette.
This cassette sprocket is for use only with SRAM brand 10spd X5, X7, and X9 cassettes. It is NOT compatible with any other brand or model of cassette. The shift points are properly timed to the tooth locations on the 36T SRAM cog for optimal shifting performance.
A longer B screw is not included with the GC. WTC has found that it is almost never needed with SRAM derailleurs and only needed for about 50% of Shimano derailleurs. CBO offers a M4 x 25 screw if you should need it.
Use of this cassette sprocket requires removal of the 17T cog & spacer from your cassette.
Compatible only with the following SRAM 10spd cassettes:
Note: the GC is not compatible with 2011 or older SRAM rear derailleurs due to the location of the upper jockey wheel. It is difficult or impossible to get satisfactory shifting with the 2011 or older SRAM rear derailleurs so we do not recommend using the GC if you have one of these. The GC works great with the newer SRAM rear derailleurs.
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