I've been working on a used beach cruiser that I bought for $75, couldn't go wrong for the price. I've taken apart just about everything and this is basically a play around with bike, see what it does. That one is running well but I decided to build a new one. It's a four stroke and the only problem I can't figure out is the clutch doesn't work exactly right. Basically the bike is always pushing forward. First question is how centered does the rear sprocket have to be? This thing is a ***** to get on and tightened down centered. I think I'm maybe a 16th of an inch off, is that good enough? I know it's suppose to be dead centered but I doubt I'll ever get it dead on center. The tire rubber parts aren't even flat. Yes I do realize why people say the adapters are the way to go. I see why now, maybe next build. My idea is to sell a couple of bikes to get the funds for some higher end bikes. I live near the beach so a beach cruiser with a motor is probably an easy sell. This build is at $350 right now. My second question is can you build a bike with gears? I saw a nice beach cruiser with hand brakes etc. but it had 3 gears so I didn't know what to do about that? First problem was the shiftier was on the throttle handle and would be in the way. Is it possible to work around a bike like that and keep the gears for when or if you pedal it?