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I ordered a QD sprocket from them and the chain kept flying off and caused some damage to my setup. Thanks for the information, I just ordered this one today!
I've finished an EV bike of my own, however, I cannot find a drive sprocket and no guide talks about what sprocket they used. I am running an eTek motor with a 7/8" output shaft and a 3/16" keyway on a 520 chain, likely a common setup... what sprocket did you use? Where did you get it? My project is sitting in the garage until I find one :(