Actual capacity of a Zee M640 mech

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  • Actual capacity of a Zee M640 mech
  • Premier Icon rossburton
    Subscriber

    My kids are riding with M640 Zee wide ratio mechs, which claim they can handle up to a 36t cassette. Does anyone know if that’s realistic or how much bigger a cassette I can use? The sunrace 10-speed 11-42 looks mighty tempting.

    Premier Icon jam bo
    Subscriber

    I had one running on 11-42. Longer B screw. Depends on frame/hanger design.

    Premier Icon rossburton
    Subscriber

    Great, thanks. Might experiment with the 11-42 on my wheels. Where does one buy longer B-screws?

    longmover
    Member

    40T is overstretched without a longer b screw, trust me I know, I learnt the hard way as it exploded and had to singlespeed home.

    Premier Icon rossburton
    Subscriber

    Noted! 🙂

    Van Halen
    Member

    zee +40t wouldnt work on my single pivot empire due to chain growth.

    zee + 42T worked fine on the HT.

    so it depends on teh frame n stuff.

    Premier Icon kelvin
    Subscriber

    36t is a realistic limit for Zee, in my experience. The new Deore mech is cheap if you want to go larger.

    Premier Icon rossburton
    Subscriber

    Ah yes, the M6000-GS. 10-speed, 42t top, and clutch. Now the boy is on 26″ wheels having a tiny mech is less of a concern.

    Premier Icon akira
    Subscriber

    Mine works on a 42 with normal b screw, full sus frame and shifting is pretty good.

    Premier Icon nwmlarge
    Subscriber

    ZEE is for sending, leave the flappy long chain at home

    davewalsh
    Member

    I have a similar experience to kelvin, in that I couldn’t get the zee to work with anything bigger than 36. Switched the cage for a oneup RadR cage and now works happily with a 42. They’re like hens teeth to get hold of these days though.

Viewing 11 posts - 1 through 11 (of 11 total)

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