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There are several frames with sliding dropouts etc that you can run fixed or geared but you're not gonna get track geo with gears. But then why do you want track geometry unless you're riding on the track? And if you are, I doubt they'll let you on with a mech hanger and cable stops
Best bet would be custom but I'm guessing thats above budget
Or modular dropouts with bolt on track ends or gear hanger
That is the issue..not keen on a conversion,really want track/crit geo with high bb