25mm would be too wide.

Don't use Velox, the edges are quite sharp and the tube thins out around the edge over time.
Velox is the best high pressure tape around but nobody is running those high pressures anymore.
It is also thick so makes tyre fitting harder.

Make sure you wipe inside of the rims to remove and small carbon debris and then use something like a couple of wraps of tubeless tape..

I personally use the supplied Zipp tape on my Zipps but add a single wrap of slightly wider tubeless tape to cover the edges.
I would use just tubeless tape but haven't been bothered to mess around and find how many wraps are needed for road pressures.
I'm just lazy.
I think the consensus is that two wraps are usually enough.
Next time I replace a tyre I will find out for sure myself.
But I don't get flats, so waiting for the rear tyre to wear out.

You need two layers of tubeless tape.

I have switched off to Silca rim tape. It is a little thinner and makes mounting tires a tad bit easier. You are going to be a 21mm.

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21mm is what we would recommend. I also like Silca's tape!

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Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling

I used Silca's 21mm tape on the set I just built. One roll is enough for two wraps on both wheels with a little left over.

is the supplied rim tape that comes with the wheels not considered good enough for latex? i've already done two races with vittoria latex tubes with the supplied tape and so far no problems

You can certainly use our rim tape with latex tubes. Latex has a way of finding any small hole so some people like the adhesive option of rim tape better, since they feel they can get a better seal.

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Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling