The new E Thirteen EX Cog comes in a 42-tooth size for use with 36t max cassettes, in Shimano tooth profiles only. There’s also a 40-tooth cog to go with 34t max cassettes, with ramps and profiles timed for Shimano, helping ensure they work as well as possible. Bonus number one: They come in colors – red, blue and black, to be exact. Bigger bonus? You won’t have to blow your bonus to get one as Retail Price is set at just .95 each. Beyond all that, they’ve gone out of their way to make it easy to upgrade your existing 1×10 or 2×10 setup by offering cassette compatibility charts and extensive how-to instructions on their website. Cogs come with longer replacement B-limit screw for derailleurs since the stock screw could easily get maxed out, particularly on the 42t setups. The compatibility chart not only covers cassettes, it also shows which 2×10 drivetrains can work. Chain wrap capacity will be an issue when used with some double cranksets. They also do not recommend using the 40t with 36t max cassettes – best to stick with the 36-to-42 and 34-to-40 upgrade patterns. Why? The ramp patterns aren’t optimized for transition between the two
Features :
42T Cog that take place behing the last sprocket of your cassette
Remove one sprocket to allow the installation (15 or 17T)
Only compatible with XT and XTR cassettes in 11-36 T
See compatibility chart in the pictures
Available in Black, Red and Blue
Material : EXA+ Aluminium
Thickness : 5 mm
Come with longer replacement B-limit screw for derailleurs
