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Dura Ace C24 wheels – sticky brakes issue

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  • June 24, 2014 at 8:17 am #21755
    Zermattjohn

    Hi all – I’ve been experiencing shuddering/throbbing brake issues with this wheelset. I’ve got Dura Ace brakes too, and the pads are new but I get a real “pulsing” feel when braking. Its pretty disconcerting and sometimes means that the rear locks up it it grabs the rim. It almost feels like the wheel is out of true, or has oil on half the rim, neither of which is the case. I’ve used Ultegra wheels and the issue doesn’t occur, so its got to be something to do with either the rim being faulty, or the brake pads being incompatible. However the rim on both Ultegra and Dura Ace C24 is alu…? Anyone else experienced this issue? I’ve had a few pairs replaced as the supplier agreed there was a problem, but it keeps happening with each replacement. Pulling my hair out – the wheels are great when you don’t want to slow down!

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  • June 26, 2014 at 9:41 am #800767
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    macrophotofly

    Highly likely its on the
    Highly likely its on the weld/join line – the metal will be more brittle and wear resistant from the heat imparted during the process – as a result the metal wears down faster around it

    June 25, 2014 at 4:10 pm #800765
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    joeegg

    Braking surface on mine is
    Braking surface on mine is perfect. Pads are centred.Its the rear wheel only and the slight inward dish is at the joint.The dish is only about 3 cm long so its not a trueing problem.

    June 25, 2014 at 12:18 pm #800763
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    Zermattjohn

    I have to say I haven’t seen
    I have to say I haven’t seen anything obvious on the braking surface. However, as I’ve been through 4 pairs its pretty odd that the same issue arises on all of them – must be some manufacturing issue? I can’t check them at the moment as they’ve gone back to the supplier (again!)>

    June 25, 2014 at 11:36 am #800761
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    Mat Brett

    Have you taken a close look
    Have you taken a close look at the braking surface?

    I thought that my Dura-Ace front wheel had gone out of true because it was grabbing under braking. However, when I put the wheel in the stand, it was perfectly true.

    Drove me nuts until I checked out the braking surface. The bit that was grabbing was a tiny raised blob a couple of millimetres across in the middle of the brake track: a little irregularity in the surface.

    I’ve never seen this before on a braking surface. It seems like the metal around it has gradually worn as a result of braking, but this little blob hasn’t. Presumably that means it’s harder than the surrounding metal??

    Anyway, I wore down this blob – tiny screwdriver, careful use of glasspaper (don’t blame me if it goes wrong) and braking is back to normal.

    I only did this a couple of weeks ago. I imagine I’ll have to repeat the process in time.

    I’d be interested to know if it’s the same issue with your wheels.

    June 25, 2014 at 11:26 am #800759
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    bashthebox

    That’s weird, I’ve got RS80s
    That’s weird, I’ve got RS80s (same rim) and have never had this. I think I briefly used shimano pads but have been using Swisstop greens for the last few years.

    Assuming the wheels are true, have you checked the calipers are pulling evenly on both sides? Are your pads toed in slightly? Are the rims clean? Is your headset tight?

    June 25, 2014 at 11:22 am #800757
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    rnarito

    Interesting thread…I too
    Interesting thread…I too have C24’s on my bike and am currently experiencing the same thing. At first I thought it might be the brake pads so I had them changed…but the pulsing sensation persists. Not terribly annoying, but on down hills I definitely feel it more. Interested in hearing what others think…

    June 25, 2014 at 10:31 am #800755
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    Zermattjohn

    Isn’t it amazing how poor new
    Isn’t it amazing how poor new wheels can be? Obviously they churn them off a production line, but to me, more than £400 is enough to spend on something for them to have been at least quality-checked before going out the door.

    I don’t think its a minor dish/out-of-true issue, as I’ve been through 4 pairs and each pair has the same issue, sometimes one wheel sometimes both. I’m thinking it must be the brake pads, though you’d think Dura-Ace alu specific pads would work very nicely thank you very much with Dura-Ace alu rims…

    June 25, 2014 at 8:05 am #800753
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    joeegg

    I have the same problem with
    I have the same problem with Shimano RS80’s.Local bike shop trued the wheel and i moved my pads a bit further out.Its better but but still not smooth.
    I put a short straight edge along the rim and found one area with a small dish.
    Looks like a machining fault on mine that can’t be trued out.
    Did a wet ride a couple of weeks ago with some steep descents and i was on my nerve ends with the grabbing.

    June 24, 2014 at 9:55 am #800751
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    Zermattjohn

    I did read on there, or
    I did read on there, or somewhere, that using carbon-specific brake pads helps as, even though the rim is alu, due to the carbon laminate there’s an amount of carbon on the rim. But, also that these brake pads are very wearing for the rim – these wheels are £600 so am loathe to risk destroying the rim.

    June 24, 2014 at 9:44 am #800749
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    glynr36

    Few threads on WeightWeenies
    Few threads on WeightWeenies mention the same thing, but no one seems to be able to solve it.

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