• Any obvious holes in this drivetrain-hack, will it function OK?

    M732 XT rear derailleur with longer B-screw
    8 speed cassette
    Shimano 6480 bar end shifter (friction for the front derailleur)
    9 speed chain
    4603 Tiagra 10 speed chainset
    FD4600 10 speed front derailleur

  • 9 speed chains are narrower internally than 8 speed

    But there's a better than even chance that the sprockets will only be 2mm thick even on an 8-speed cassette. It's probably going to work in practice.

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