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Wolf Tooth 42T GC Cog for SRAM

Wolf Tooth 42T GC Cog for SRAM
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The product that set the standard and still the best available! The GC line of cassette extender cogs allow you to modify your 10-speed cassette into a wide range cassette. To achieve the optimal shifting, the GCs are optimized for Shimano or SRAM cassette so always select the correct type for the cassette brand you have.

- Compatible with SRAM 10-speed cassettes listed on the GC tech page
- Compatible with all 10-speed chains
- Note that you may need a longer chain that you currently have on your bike
- Chain stretch should be less than .5 when installing a new GC
- Compatible with all 10 speed rear derailleurs except non-clutch type SRAM rear derailleurs model year 2012 and older
- These older rear derailleurs do work with the GC40.
- Can be run in 2x configuration with a long cage rear derailleur
- These may fit tightly on some over-sized hub bodies such as Stan's No Tubes 3.30 and the Easton X4 hubs. With a little filing and some grease they will go on.

Part Numbers

Option UPC MPN Store SKU
Silver / 42T 812719021067 SILGC42SRAM 210000022164