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Lister, here's the scoop from the Zipp site. Of course they recommend their own pads, my LBS did not carry, plus I heard they wear quick. I still think this guy had some mechanical issue...
"From a data point of view, the braking of carbon rims is very specific to the manufacturer, so you will generally be best to do what they recommend. Our silica ceramic surface is actually slightly more agressive than aluminum when dry and about 96% as effective when wet when using the specific Zipp pad. Many rims like those from Corima, Campagnolo and many of the Taiwanese rims have a pure carbon surface at the brake track and you will need to use a cork pad so as not to damage the rim.
The cork pads are soft and have a low coefficient of friction, but will not damage the all carbon surface. For more aggressive braking a stock Shimano or Campy pad can work, but these contain abrasives such as aluminum oxide which can damage a pure carbon surface (aluminum oxide is the stuff they make sand paper from). Campy and Shimano pads will not damage a Zipp rim as our surface is very hard, but the Campy pads specifically are so agressive that they generate excessive heat and can melt, leaving melted brake pad on the rim, which is almost worse than wearing the rim out as the melted pad material can cause brake pulsation and can be very hard to remove.
Our pad is thermally conductive for lower temperatures, and will not melt, so it is very safe for any carbon rim, and works well on aluminum rims. Our pads also will not abrade your aluminum rims making them last longer, but for most any other carbon rim you are really safest to use cork which is completely non-abrasive, but really doesn't work well at all on aluminum rims. "
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