I would like to incorporate my more powerful than average bottle generator on my GEBE/Tanaka powered MTB. The bottle generator I have is a pricey $$ Dymotec S12that powers a 12v lumotec Halogen oval plus light and tail light. I bought this generator for use on my recumbents and used it for one night only. WHY--Because it has a lot of drag. I like the bright 12volt light that it produced but the drag was a drag. I went back to my SON hub dynamo. I wonder if having the bottle roll on a smaller diameter disc or pulley [say 10"dia maybe] that would be mounted to the front spokes would work. I'm thinking that the smaller diameter would not burn up either the bottle or the bulbs. input or feed back is appreciated.