Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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120 is an old spacing.
126 was common for 7 speeds.
130 or 135 > 7 speeds, with MB's being 135 and road bikes 130.
Just build your wheel with 130MM "road" spacing and stuff it in the drop outs. They'll spring a few MM without problem.
I think "technically", you may have to redish the wheel a couple MM's, but in reality, probably not.
I've stuffed 130 into my 126 RockHopper and can't see that the wheel ISN'T centered. I did use a mishmash of parts though, so maybe it just happened to "work out"?.