We sourced the most heavy duty chain on the market to make sure it can keep up with the demand of our ultra powerful eBikes. This X9 chain is purpose built to be high torsion resistant and ultra durable. Mule Jag Mule Jager: Rohloff hub with 108 links (This chain WILL work) Flatlanders, Kodiaks, Mules, Storms, Storm Jagers, and Scout Jagers: (This 9sp chain will not work) Scout: 11 speed with 124 links (This 9sp chain will not work) Carbon Alpha: 12 speed 122 links (This 9sp chain will not work)