I'm looking to build up a front wheel for windy-day rides. The primary criteria is to be least affected by cross winds. So, essentially the shallowest rim I can get. I have experience with an alloy rim that I like, Bontrager Paradigm that looks to be 18 mm deep. And this is likely what I will end up buying. But, if I can get a carbon rim that is significant lighter, I would use that. But so far, I'm not finding any really shallow carbon rims. Best I have found is 25 mm deep. though I have dismissed, out of hand, the really expensive rims >$400.

So, I thought I'd ask here if someone has a suggestion for a shallow <20 mm deep carbon rim.

Of course, susceptibility to cross winds is not just about rim depth, the way it handles airflow (stalling) is a factor. This is one reason I like the Bontrager rim mentioned, it has a nice aero-like profile, so I believe it is likely as good as any shallow rim as far as air flow is concerned. It's just it is heavier than a carbon rim would be by probably something like 150-200 g. The extra weight is not a big deal, but lighter is better than not.