Rubber gasket on rear wheel of hybrid squeeking
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  1. #1
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    Rubber gasket on rear wheel of hybrid squeeking

    The attached photo is of my Trek 7.5 hybrid. The rubber gasket I have marked with the red arrows is on my rear wheel. What is the purpose of this??? It is driving me crazy as it rubs and squeaks when I slow down.
    If it must be there how do I lubricate it?

    I do not have one on my road bike.

    Thanks for those who respond
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  2. #2
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    I saw some of those on an MTB I was working on a while ago. How old is the bike? How many miles?

    Anyway, I think the idea is a secondary grease seal. They fit kind of tight over the cone and lock nut, attached to the axle. you should also have a grease seal attached to the hub. Anyway, if you remove the Quick Release or axle nut, then you should be able to carefully pull or pry the secondary seal off the side of the axle.

    It would be a good time to repack the bearings if your wheels are a few years old. Otherwise, just add some bearing grease to the inside surface between the secondary seal and the primary seal, and push it back together. You could leave a slight gap if you wish.

    Your bike would also survive removing and discarding the secondary seal, depending on the environment you use it.

  3. #3
    wim
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    Most likely, there's no need to disassemble anything. Just put a drop or two of light oil on the junction between the rubber seal and the hub metal. Grab the rubber seal, massage it a bit and rotate it around a few degrees to make sure its seated correctly and to spread the oil. Wipe off any excess oil, done.
    Last edited by wim; 08-31-2014 at 02:58 AM.

  4. #4
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    Quote Originally Posted by wim View Post
    Most likely, there's no need to disassemble anything. Just put a drop or two of light oil on the junction between the rubber seal and the hub metal. Grab the rubber seal, massage it a bit and rotate it around a few degrees to make sure its seated correctly and to spread the oil. Wipe off any excess oil, done.
    Yup. That's all it takes. And if you do disassemble the hub, not need to be careful in removing that boot - it pulls right off.

  5. #5
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    It's a seal, not a gasket.

    I just slap some grease inside of that cap and wipe off the excess (silicone is best for rubber... but, any grease really, so long as it is rubber safe... ideally the grease used for the bearings, but that's an unknown in this case). It's just a seal to keep water out of the hub's ball bearings.

    Oil is good advice, but it might require more frequent reapplication.

  6. #6
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    I oiled it and the squeak continued. I then noticed that the front wheel has a small rubber gasket on both sides, oiled those...and now quiet. Got to love quiet.

    Thanks for all the suggestions

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