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There's some people over on the TT 250 owners page on Facebook that have dropped down to a 43 using what I believe is a JT sprocket that they are opening up the center a bit and then flipping the stock sprocket and using that as a spacer. They seem to be getting good results with this setup. I'm thinking about trying it myself since my TT is used solely as a commuter and I'd like to have it turn fewer rpm since a good stretch of it is 55 mph. The only thing that I would like to do is machine down the stock sprocket so it doesn't protrude above the new one but that's more of a visual thing rather than a functional one.
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