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I know its not finished. But isn't 38 x 13 in polo ratio territory?

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38x13 is ~78 gear inches.

Which is high.

Build a wheel around a track hub and either dish it, or fit a new bottom bracket to tune a good chainline. UTFS and you'll find lots of info about converting a road frame to fixed as it's how most people used to start out.

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Oh, sorry, I didn't check the GI. Just saw the picture and saw the front ring was tiny and almost polo like.