E*thirteen Extended Range Cog.
- Extended range aluminum 42t cog to fit Sram 10-speed cassettes
- 42t is compatible with 36t max cassettes
- Remove the existing 17t and add the Extended Range cog without any additional spacers to create an 11-42 10-speed cassette option
- Cogs come with a longer replacement B-limit screw, to avoid running the derailleur with the stock screw maxed out
- Intended for use with 1x drivetrains. Chainwrap capacity will be an issue for those wanting to use double cranksets