I need a 12.5inch Brushless Hub Motor. Suggestions?

I need a 12.5 inch Brushless hub motor for my Schwinn Stealth and I'm having a difficult time finding something that's worth anything. I know I could get a bigger scooter and probably be better off, but I like the idea of flying around on my little "toy." I'll take as big as I can get. My goal is eventually 50mph, but I'll settle for much less for now. I don't think I'll be able to hit 50 without a chain drive and a massive motor, like a brushless e-tek. Any help anyone can give me would be greatly appreciated. Thanks