CNC Sprocket adapter help!


New Member
Jan 7, 2020
Hey, Im pretty new to this forum. I have a 4 stroke engine kit on the way and I've never built a bike before so Im pretty new at this. Im trying to motorize a electra townie, and the rear hub of that is a SG-3C41. I bought a 1.8" CNC sprocket adapter and it does not fit because the adapter is too small :( I haven't seen any bigger sprocket adapters then 1.8" so what can I do here? I think someone else said that the hub is 1.86" but I didn't think that .6 of an inch would be that much of a difference. I feel like I just wasted $60 :(