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I'm running GP4000sII with carbon clinchers from DCR wheels and actually asked the question about warnings from some tyre manufacturers. He was unaware that there was an issue and said none of his customers had ever had a problem. Maybe its more of a problem with crabon ordered direct from manufacturers... I certainly didn't notice that they were in any way sharp but it's early days yet!
I need a fresh set of gumwalls but i'd avoided veloflex because of the warning on the box you can't run them with carbon rims