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aka-
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
PhilDAS
MisterMikkel
Ah ok, my bad.
Well in that case I remember an Isaac frame I think it was that had swappable dropouts so you run it geared or fixed but the geometry was terrible for fixed gear use. It came into the velodrome and the pedals were almost hitting the banking in the straights!