e*thirteen E*Thirteen Extended Range Cog Shimano Compatible (Black) (42T)

Features:

*Extended range aluminum 40t or 42t cogs to fit Shimano 10-speed cassettes
*42t is compatible with 36t max cassettes while 40t is compatible with 34t max cassettes
*Remove the existing 17t and add the Extended Range cog without any additional spacers to create an 11-40t, or 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

Specifications:
Teeth: 40t / 42t
Color: Black
Version: Shimano
Weight: 65g / 70g