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  1. #1
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    Why caged bearing only on Disc Rotor side of Shimano Hub M775

    Why caged bearing only on Disc Rotor side of my Shimano Hub, but free ball bearings on the cassetee side, Both sides have 3/16 inch beargs, 11 in the left cage but 13 on the other side.

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    Senior Member Bill Kapaun's Avatar
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    if it was a full compliment retainer would it matter?

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    Senior Member rydabent's Avatar
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    But it would be interesting to hear the engineering logic of doing it that way.

  5. #5
    AEO
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    Quote Originally Posted by rydabent View Post
    But it would be interesting to hear the engineering logic of doing it that way.
    possibly for easier assembly.
    the Dura Ace FH-7800/7801/7850/7900 all use a retainer.
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    Quote Originally Posted by rydabent View Post
    But it would be interesting to hear the engineering logic of doing it that way.
    Exactly. I'm an engineer, I wanted to know if someone KNEW the reason.

    My theory is that the caged bearing on the left side of the hub is because of the off balanced forces when using the Disc brake. The unbalanced loading on the right side of the hub, and in particular on all my bikes, due to the chain is slight...thus free balls on the right side.

  7. #7
    Senior Member gyozadude's Avatar
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    Quote Originally Posted by AEO View Post
    possibly for easier assembly.
    the Dura Ace FH-7800/7801/7850/7900 all use a retainer.
    I'd have to agree. It's easier to assemble with cages. And if you can't do both sides, even doing one side is easier and better for quality control purposes. They also probably looked at their wear-data on the drive side and found that 15 - 20% more bearing contact on the cups/cones on the freehub side would probably help prevent premature pitting since the right side must support both weight load and most of the axle load for pedaling. The left side doesn't structurally need it, so a cage is good enough. But can't the OP swap out the cage with loose after the fact?
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