I did the same thing myself last year, but I made the mistake of using a standard chain ring from a mountain bike (a 38 tooth) so It did not like to stay on too well. I found out that Kings sales and service makes an adapter and sprocket that does the same thing and that is what I am using now. Its been about a year and the sprocket is one of the few things that is still working well. I seem to have problems with the bolts coming loose on the hub after a few miles and then I over tightened two of the bolts and had to helicoid them to get them to work. So I would recommend blue lock-tight on those bolts before you have the whole thing fall apart. Putting anything on these bikes is like bolting something to a paint shaker and letting it run on high.