Wolf Tooth

GC45 45t Giant Cog for Shimano 11-speed Cassettes

The Wolf Tooth GC 49 Cassette Extender Cogs allow you to modify your 11-40t or 11-42t 11-speed Shimano cassette to create a wider range 11T-45T cassette.  To retain the same shifting quality as the stock gear range, the Wolf Tooth Giant Cog 49s have a tooth profile that is optimized for Shimano cassettes. To even out the gear range a replacement 18t cassette cog is also included.

Wolf Tooth has a complete step by step instruction and compatibility guide for the Giant Cog here

• Includes 18T cassette cog for optimal gearing in the smaller cogs. 
• GC49 features 7 shift gates for faster shifting. 
• Compatible with Shimano 11-40t and 11-42t 11-speed cassettes 
• Not compatible with SRAM XD-style or NX cassettes