In setting up for the first road race of the season this weekend, and I have a spare set of clincher wheels (race wheels are tubies) and I bought a pair of 49g innertubes to lighten the load. They seem pretty thin and was wondering if that was the way to go, or should one just run standard weight innertubes.

Looks like rain this weekend, should I leave the Zipp 303's at home or are they fine wet?

Thanks for any advice--related to the above of course.