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  1. #1
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    Dotted line brake pattern

    Let's take any random picture of used rim. This, for example. What causes such dotted line trace? Skewed axle? Improper angle of brake pads?

  2. #2
    Bike rider alexaschwanden's Avatar
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    How many years or miles are on those wheels?
    2014 Felt Z5 Carbon 1937.0 miles

  3. #3
    Senior Member BlazingPedals's Avatar
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    The wear spots all line up with spokes, right?

  4. #4
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    Who knows...

    I'm asking this because there's fair amount of wheelsets on CL with such brake pattern. I have never had this on my bikes, hence my curiosity.

  5. #5
    Senior Member CliffordK's Avatar
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    There is a big question of machined sidewalls vs anodized sidewalls.

    The anodized may not make a big difference, and may even last longer due to two layers to wear through. However, they wear unevenly making the dotted lines, and look bad very quickly.

    Anodized on top, machined on the sides and they look prettier.

    When my pads wrap around the top of the rim, I've noticed that kind of a wear pattern where the spokes have slightly stretched the top side of the rim. I am a bit surprised that the spokes would make an outward bulge. Although, perhaps the spokes create micro-flat spots in the rim, which cause it to bulge.

    If you see Velocity NMSW, they are non-machined sidewalls, and are most appropriate for building with disc brakes.

  6. #6
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    ^ makes sense. Thanks for clarification.

  7. #7
    Senior Member zandoval's Avatar
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    Seen this on old steel wheels that have been abused. On those wheels its obvious that the rim was deformed or rather spread out at the spoke holes...

    The wheels I am talking about were so bad that the brakes would chatter when applied...

  8. #8
    Old. Slow. Happy. MileHighMark's Avatar
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    Hard-anodized rims with (double) eyelets almost always have this wear pattern.
    I like bikes. Oh, and doughnuts, too.

  9. #9
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    noticed it on my anodized rims back in the 90's and decided the spoke tension was causing the braking surface to be uneven. you would have thought that rim maker's would have tested the rims enough to notice it and avoid anodizing the braking surface. but noooooo....

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