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  1. #1
    mtbr member
    Reputation: amaurosis fugax's Avatar
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    Converting Cobalt 2's to Tubeless

    I have just obtained a set of Crank Bros Cobalt 2's, which as you may be aware require no rim-tape for tubes as the spokes are not exposed in the rim. I'm quite happy to run tubes but would like to give tubeless a go.

    So my questions relate to how I run a tubeless set-up.

    Looking at Stan's No-Tubes website I see two options:
    1. The Standard Rim Strip with presta valve incorporated

    2. Universal 35mm Valve Stem

    If I use option 2 how does the valve attach to the rim? Does it screw in? Or does the pressure hold it and seal it?

    Many thanks in advance and sorry if it seems a dumb question but I can't work it out

  2. #2
    Former Bike Wrench
    Reputation: mtnbiker72's Avatar
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    The knurled lock nut put on finger tight is plenty to hold the valve in place and seal it

  3. #3
    g3h6o3
    Reputation: PissedOffCil's Avatar
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    I thought all Cobalt wheels were tubeless ready... No ?
    Check out my SportTracks plugins for some training aid software.

  4. #4
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    Thanks mtnbiker72, It seemed to me that I would need more than that to hold it.
    I shall get the No-Tube Universal valve and some gunk and give it a go. cheers

  5. #5
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
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    Quote Originally Posted by amaurosis fugax View Post
    Thanks mtnbiker72, It seemed to me that I would need more than that to hold it.
    I shall get the No-Tube Universal valve and some gunk and give it a go. cheers
    CB has tubeless valves designed specifically to fit the inside of their rims.

    But be careful. The rims are not UST spec. I have specifically asked CB what tubeless tires they are designed to use. They will only say "tubeless", and will not comment further.
    mtbtires.com
    The trouble with common sense is it is no longer common

  6. #6
    Ow!
    Reputation: clydecrash's Avatar
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    I have two sets of Iodines that I run tubeless. One set uses the CB valves, the other is using Stans valves. Both seem OK, but the CB valves sealed immediately. The Stans leaked a little before they sealed, but seem to work OK.

    Also, the tubeless tires I use seem to install the same as when I install them on Mavic UST rims. Some easily with a floor pump, some not so much.

  7. #7
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    Next question.... where can you get Crank Bros Tubeless valves?
    They don't seem to appear on their web-site.

  8. #8
    Ow!
    Reputation: clydecrash's Avatar
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    Just call or e-mail CB. I am certain they will help you out.

  9. #9
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by amaurosis fugax View Post
    Next question.... where can you get Crank Bros Tubeless valves?
    They don't seem to appear on their web-site.
    valve stems - wheelsets
    mtbtires.com
    The trouble with common sense is it is no longer common

  10. #10
    mtbr member
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    Thanks Shiggy.
    I sometimes think my ability to use the internet is failing.
    Its like trying to find the milk in the fridge.....staring me in the face!

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