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Yeah I don’t get why you’d be against a 120mm spaced frame?
Chances are you’re gonna end up running the same chainline on a 130mm frame as you would on a 120mm one, just on the 130mm frame you’ll have some extra spacers on the rear axle, have to make sure you get a hub with a long enough axle to get proper engagement of the nuts and the chainstay design might limit the size of chainring you can run.
I’d understand if you already had some parts you want to use and they would work best on a 130mm frame but it doesn’t really sound like that and generally I’d have thought people do 130mm fixed because they have say, a tt frame they want to use fixed. Seems odd to be actively seeking out 130mm spacing.
is not really necessary,mostly limitating..you can have a front disc hub converted to rear with spacing at will,so is that