Well, I got one of the bikes I sold back and am in the process of rebuilding it (the bicycle motor works fine, the bike itself is hurtin') so I'm going to check the hole and see if it was drilled off center like Norman had mentioned.

I also got a 36T from that'sdax and it looks to be of 100% better quality than the stock sprocket. I'll measure the hole and see if it's centered too.

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If it ain't broke, and you mess with it long enough, it will be.