• I just re-spaced an ultegra hub from 130 > 126. Could have cold set the frame, could have bought the right hub for the job, but difference in dish/spoke length required is less than 0.5mm so no biggy. If I sell the wheels on afterwards can put the 4mm spacer back in and re-dish accordingly.

    Main issue you might have on an 126OLN frame is smallest cog striking dropout or a stay as they weren't thinking of having clearance for a 10s cassette to be jammed right up against the locknut

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