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Using 120mm makes life simple for getting an acceptable chain line
Balls. Pretty much any track hub can take a 5mm spacer each side and become a 130mm OLN hub, and it doesn't change to the chainline.
gbj_tester-
I dunno about Pretty much any....
The novatec hubs we have on the precursors at work have the axle ends flush or even slightly recessed into the nut at 120mm. With 5mm spacer on each side I’d be worried about how much thread was engaging in the nut. And it’s not like PC track ends are overly thick.
Similarly, I have a DT Swiss track hub on my Pomp and even on those thin steel track ends the axle is pretty much flush with the end of the nut.
That said, I probably tell someone everyday I’m at work that their axles need trimmed because they are protruding beyond the nut so there are definitely plenty of hubs with aches king enough for spacing out but also plenty that won’t take it.
M_V
Using 120mm makes life simple for getting an acceptable chain line.