They Expert would have 105 hubs and the Master 600. My Experts had straight gauge spokes. Maybe the Master had butted? My Turbo (pre IM) had butted spokes. It is more fun knowing you have a 6208 back there while you ride but I doubt you can tell the difference.
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I don't do: disks, tubeless, e-shifting, or bead head nymphs. But I do hate all e-bikes.