I have a Trek 4300 mountain bike with a Shimano RM30 8-speed freehub that's slipping badly. When I search for a replacement, some places seem to interchangeably suggest the RM33, but I was hoping someone could confirm that the RM33 is a drop-in replacement.

(The reason I haven't just bought another RM30 is I can't seem to find an 8-speed RM30 replacement- perhaps the RM33 supercedes it? I can't tell.)


1 Answer 1


The freehub should fit fine, the RM33 is for the updated/higher end disc hub version but it is backwards compatible to RM30. Actual part# for the RM33 freehub is Y30V98050

  • That's exactly what I needed to know! Thank you!
    Dec 23, 2018 at 2:12
  • 2
    Update: Got it and installed it. Fit perfectly. Thanks again.
    Jan 3, 2019 at 4:04

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