Ok so I'm building a pred powered bike. I'm a big guy270lbs. I have a welder and I'm a halph decent fabricator. My question is this 10:1 ok? Ill be climbing alot of hills and my china girl dose just fine w a lil help. I'm not after speed. 20-25 is just fast enough for me. Second question: I'm going to use pulley and belt drive w no cen clutch just a spring loaded tensioner w an idler pulley. Should I make a backing plate w a bearing on the output shaft or mount my jackshaft and tensioner to the frame? I've created a unique frame that should be able to handle way more power than a 99cc can put out. Ill post pics soon.