Wolftooth components have added a larger option for their cassette adapter. The GC 49 cassette extender cog allow you to modify your 11 speed cassette from SRAM or Shimano to create an ultra-wide range 11T-49T cassette. To achieve the optimal shifting, the GCs are optimized for Shimano or SRAM / SunRace cassettes so we have two different 49T cogs available. Includes 18T cassette cog for optimal gearing in the smaller cogs. Drop your bike off and we will make that bike capable of conquering any mountain on the planet!wolftooth gc 49