from my thread a couple of weeks back I got these at the recommendation of another member:
http://www.parker-international.co.uk/1889/Continental-Competition-Vectran-Tubular.html
650x22, all black, road tyre with decent puncture protection, valve is fine on my HED deep rim (not sure exact measurements though) but not that cheap at £50 - though with a Zipp you probably want a decent tyre.
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from my thread a couple of weeks back I got these at the recommendation of another member:
http://www.parker-international.co.uk/1889/Continental-Competition-Vectran-Tubular.html
650x22, all black, road tyre with decent puncture protection, valve is fine on my HED deep rim (not sure exact measurements though) but not that cheap at £50 - though with a Zipp you probably want a decent tyre.