Shimano used to make direct mount rear mechs that screw onto a hub axle - hone I think it was called . That will get you 1 by9 if you do not want to go internal hub.
@Jeromeo started
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Shimano used to make direct mount rear mechs that screw onto a hub axle - hone I think it was called . That will get you 1 by9 if you do not want to go internal hub.