Devilmaycare Cycling Fool
Join Date: Aug 2001
Location: Wynnum, Australia
Posts: 3,819
Bikes: 1998 Cannondale F700
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The bead has nothing to do with puncture resistance. A kevlar bead will, as you say, be lighter, and it will allow you to fold it. A kevlar casing will supposedly protect against flats better, but even that depends on the threads per inch (the more the better).
I use Geax slicks, which rely on thicker rubber and seem to work ok. I've only had a couple of flats with them as opposed to the three a week I was getting before that on my IRC metros. As chi said, run 'em hard. I pump mine to 100psi.