Originally Posted by
Lenton58
If you cold-set back to 120, you are re-moving the spacers because:
* If it is a 126 mm hub, then it is really (maybe/usually) a 120 hub made to be spaced out as 126? (I could get out the calipers and diddle this up, but not until tomorrow ... or when I next have time.) Of course this would only affect the hub/wheel centering. The chain-line is another element in the conversion — right?
Please overlook my slowness. The humidity here is high 90's percentile, and I grew up in Vancouver! SIGH!
Thanks
120mm and 126mm road hub shells have no perceptible differences if any. The idea with road hubs and a BMX freehweel is get the freewheel as far over to the right as possible in order to set the chainline. It's virtualy impossible to do this with 126mm spacing without swapping to a short BB spindle. With vintage high profile cranks the small chainrings very close to stay to begin with so a shorter spindle isnt always an option.