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  1. #1
    Constant tinkerer FastJake's Avatar
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    Why does my Mavic Cosmic wheel have holes drilled in it???

    I bought a Mavic Cosmic Expert tubular wheel on ebay, and it just arrived today. It rides great, but one thing is bothering me. It has 4 holes drilled in the rim, spaced 180 degrees from eachother. Two on one side and two on the other. The pairs of holes are 90 degrees off. Is this normal? Should I send it back?



    (Sorry for the terrible picture quality)
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  2. #2
    Senior Member TLCFORBIKES's Avatar
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    I am not sure of the "official' reason but it does allow water to escape.

  3. #3
    Senior Member Mr. Fly's Avatar
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    Quote Originally Posted by TLCFORBIKES View Post
    I am not sure of the "official' reason but it does allow water to escape.
    That.

  4. #4
    Certified Bike Brat Burton's Avatar
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    Rats - now I feel cheated!

    Quote Originally Posted by FastJake View Post
    I bought a Mavic Cosmic Expert tubular wheel on ebay, and it just arrived today. It rides great, but one thing is bothering me. It has 4 holes drilled in the rim, spaced 180 degrees from eachother. Two on one side and two on the other. The pairs of holes are 90 degrees off. Is this normal? Should I send it back?



    (Sorry for the terrible picture quality)
    My Cosmic Elites only have one hole per side - two per rim. But these are ten years old - looks like you got the new, improved model!

    No idea - I always assumed it was part of the manufacturing process - maybe to equalize pressure when the rims were welded up. Of course that can`t be true because the one in your photo is right beside the weld line.

    But mine have worked just fine so you should assume yours will too.

  5. #5
    Constant tinkerer FastJake's Avatar
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    Quote Originally Posted by Burton View Post
    My Cosmic Elites only have one hole per side - two per rim. But these are ten years old - looks like you got the new, improved model!

    No idea - I always assumed it was part of the manufacturing process - maybe to equalize pressure when the rims were welded up. Of course that can`t be true because the one in your photo is right beside the weld line.

    But mine have worked just fine so you should assume yours will too.
    Cool, thanks everyone. I'll stop worrying now.

    That's actually not a weld line, but just some goo overflow from the decal. Better pull out the drill so you can keep up with me! Haha. 4 holes per side should do it.
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  6. #6
    Certified Bike Brat Burton's Avatar
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    He who has the most holes wins!

    Quote Originally Posted by FastJake View Post
    Cool, thanks everyone. I'll stop worrying now.

    That's actually not a weld line, but just some goo overflow from the decal. Better pull out the drill so you can keep up with me! Haha. 4 holes per side should do it.
    So looks like you`re out in front and I`m feeling too unmotivated to play catch-up!

    Just out of curiousity I`d like you to double check that joint though. Agreed there are cheap flashy stickers on the rims, but its a circular cutout around the yellow `Mavic` balloon and what I`m seeing in your photo is a vertical line. The rims are welded and then the braking area is CNC machined, but the rest of the joint isn`t smoothed out at all and I`m sure thats what I`m looking at. And mine are the same too.

    Nice wheels!

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  8. #8
    Senior Member Mr. Fly's Avatar
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    Quote Originally Posted by Burton View Post
    No idea - I always assumed it was part of the manufacturing process - maybe to equalize pressure when the rims were welded up.
    Well, if that's the concern, then the spoke holes should do a much better job!

    FWIW, my deep Campagnolo rims have those holes as well, although maybe not that big.

  9. #9
    Frozen in carbonite Grimlock's Avatar
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    I hopes that's jokes, Monsieur Fly. Everyone and their grandmother should know spoke holes are drilled afterward.
    Quote Originally Posted by sp00ki View Post
    Using a nicer sealed bearing headset vs a $10 set is like throwing a frisbee vs a dodgeball.

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