Need Grubee gearbox output shaft dimension

Discussion in 'Frame Mounted Engines' started by mmachine, Aug 3, 2009.

  1. mmachine

    mmachine Member

    Although I don't have nor plan to buy a Grubee 4stroke gearbox was
    still wondering what the output shaft dimension is. Could one of you
    kind folk pass me a measurement?

    Asked a vendor got nothing, searched this forum and big G but got
    nothing there either.

    Tis a small favor I ask.


  2. mmachine

    mmachine Member

    please help


    Really need this info, all them Grubees out there and no one can help?
  3. MotoMagz

    MotoMagz Member

    Not really help but..This is the Gbox shaft you are talking about.?Sorry but I have no way of measuring it without taking it apart.Maybe you can PM Biketec for an answer. MotoMagz

    Attached Files:

  4. MotoMagz

    MotoMagz Member

    Hey, If your talking about the shaft coming out of the motor it is 15.8 x 33.5 mm. MotoMagz
  5. mmachine

    mmachine Member

    Yes that's the output shaft.

    Looking for the dimension where the freewheel is attached.
  6. HoughMade

    HoughMade Guest

    Are you talking about the dimension of the shaft between the gearbox and the freewheel where the arrow is pointing below?

    If so, I can try to measure that tonight- but two things. First, I'm not sure my caliper will fit in there, especially with the tight dimensions on my frame, but I will try. Second, as you can see from the pic above, there is a shoulder on both ends of the shaft. This means that the diameter of the shaft where the freewheel mounts is reduced from the part of the shaft I possibly could measure. I am not going to take my freewheel off unless and until I absolutely have to (it has never been off), so I cannot measure that reduced diameter.

    ...but like i said, I'll get what I can.

    Attached Files:

    • 51.jpeg
      File size:
      4.3 KB
    Last edited by a moderator: Aug 5, 2009
  7. mmachine

    mmachine Member

    I can see by the questions y'all are asking that I did a lousy job of
    describing what's needed.

    Yea, the hidden dimension within the freewheel. It's fully understood
    that you wouldn't wish to remove that just for my meager cause.

    Just thought there would be enough Grubees laying about someone
    would know, especially the vendor of said parts.

    I've seriously run out of time so ordered the freewheel to find out.
    When it arrives the dimension will be posted here incase someone
    else needs it.

    What I'm doing is converting/rebuilding the guts of a crummy gearbox
    and will try the gru freewheel on it.
  8. mmachine

    mmachine Member

    the dimension is

    OK the 11t freewheel sprocket will fit on a 11mm shaft which converts
    to 7/16 for the inches crowd.

    Perhaps someone besides me will find the info helpful.