Re: 54 teeth chainring? If you can get your hands on an old Schwinn Exercycle they have 60-64 tooth sprockets on them. I picked one up at a yard sale for $20 for the bike and the only thing that I wanted was the sprocket  ...Kelly
PS. They are solid and could easily be drilled to use as a MB drive sprocket.
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I'm racin' Spitfire, turnin', poppin' wheelies, burnin' evil chasin' pop,pop, pop,pop,pop.... (The Pixies-Tony's theme)
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