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  • I thought the 68/73 switchover occurred in the 90s

    There was no "switch-over", both widths have always existed side by side since 73mm first arrived. The question is moot, since Shimano HT2 MTB cranksets will work with either, they just use a 2.5mm spacer each side between the cups and the shell for 68mm and omit them for 73mm.

  • I know you can use spacers. But some people have a preference for road cranks because of chainrings, aesthetics, weight, Q-factor, whatever. "you might be able to use road cranks" was the nub of my comment

  • "you might be able to use road cranks"

    That's going to need some careful measuring to check that the narrower chainline and Q don't interfere with the chainstays

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