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Nah, I sold my wheel covers when I got a disc. Technically I still have some but they're attached to a rim brake 808 (my old race wheel).
80mm valves will work fine but I'm not likely to find them on the road if I have issues with the tubes I carry. I like to be able to use any normal tube and I'm annoyed my Topeak extenders don't fit - they are nifty because they can screw the valve open/closed. My Zipp one vents air when inflating.
Cool, don't forget your wheel covers!
Won't they work with 80mm valves without an extender (to get seated, obvs you need to take extenders for punctures)?