Originally Posted by
seamuis
you wouldn’t actually need to do anything if you use a 120mm hub. I have a 126 conversion and it takes literally no extra effort to simply hand tighten the nuts down and take in the 3mm per side. I mean, there’s nothing wrong with dropping some cash on a couple of spacers, but it’s completely unnecessary.
I did that for a while after first building up my FG conversion. It does work, but it's always nice when your hub is the same width as the dropouts, so that the wheel holds itself in place while you make adjustments and tighten the nuts.
I don't remember the 3mm axle spacers being serious cash.
