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  1. #1
    mtbr member
    Reputation: Hoban's Avatar
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    Presta valve hole drilled out...

    Got a used bike a few months ago that I'm stripping down for my new frame. The wheels are Sunringle MTX33s and the previous owner drilled the rear valve hole out to take a normal schrader valve tube.

    I don't want to carry two tubes. Is there a fix you can recommend? I suppose I could have someone tig a washer or something on the inside, but not sure these wheels are worth the hassle.

    Would installing a small washer over the valve with a presta tube work?

  2. #2
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    Reputation: Saul Lumikko's Avatar
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    Unless you use very high pressures, you can just put a presta valve stem through the enlarged hole. Tubes have a large reinforcement around the valve so it'll be fine. Just make sure the hole is chamfered so it won't make cuts to the rubber.

  3. #3
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    Presta tubes will run fine in it
    Former bicycle mechanic for 8 years, current soil scientist.

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  4. #4
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    Reputation: Fix the Spade's Avatar
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    It'll be fine.

    But Mavic do little plastic adapters if it continues to bug you.
    http://www.sjscycles.co.uk/mavic-rim...esta-prod3335/

  5. #5
    mtbr member
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    Quote Originally Posted by Saul Lumikko View Post
    Unless you use very high pressures, you can just put a presta valve stem through the enlarged hole. Tubes have a large reinforcement around the valve so it'll be fine. Just make sure the hole is chamfered so it won't make cuts to the rubber.
    Awesome. I have noticed there was a reinforced ring. I'll give it a try. thanks.

  6. #6
    www.derbyrims.com
    Reputation: derby's Avatar
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    There is a spacer, Schrader to Presta, some bike shops carry.

    Like others say, it's OK without the spacer at the low pressures used off road.

  7. #7
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    Mavic used to ship their schrader valve rims with a "bushing" just in case the costumer want to run presta tubes, now this is a long time ago but maybe you get lucky at your LBS..

  8. #8
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    I'm a member of NSMBA and IMBA Canada

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