Cassette Cogs

40T GC Cog for ShimanoThe 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. 
Compatibility:

Compatible with Shima

The Wolf Tooth GCX 46T is the ultimate bailout gear for those really steep climbs. Get nearly the same range as Eagle with your existing 11-speed drivetrain! The GCX 46T sprocket replaces the stock 42T on your XX1 or X01 cassette while adding some color i

Need just a little bit lower gear for those big climbs? The Wolf Tooth GCX 44T sprocket replaces the stock 42T on your XX1 or X01 cassette while adding some color if you prefer! This is roughly equivalent to changing your current front chainring to a 2T s

42T GC Cog for ShimanoThe GC42 cassette cog is so big that when machining the first batch, the machinist thought he made a mistake!  The GC line of cassette extender cogs allow you to modify your 10 speed cassette into a wide range cassette.  To achieve t

GCX 42T Cog for SRAM XX1/X01Whether your biggest cog on your X01 or XX1 is worn out or you just like a flash of a little more cassette color, the Wolf Tooth GCX 42 sprocket is exactly what you need. Shifting performance and durability matches the stock pa