Any thoughts on the 19mm vs 23mm wide aluminum tubular rims? Does it work the same way wider clincher rims claim?

The tubs shape is determined by the tub not the rim. A wider tubular rim just gioves a wider gluing surface. Useful for cyclocross I think. A wider tub rim means a more aero profile (slightly) when a wider 25mm tub is used.

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The flange spacing is not that bad. You could build a good wheel with those hubs and rims, but geez 190's seem like a serious waste of money imo.

The general issue with DT hubs is that the flange spacing isn't as effective for building a stable wheel as on a Chris King or Dura Ace or Alchemy or whatever. But that's a problem with any rim you build on those hubs. DT's aren't bad, just not quite as good as some others.

I second the question of why you'd use 190s with Nemesis rims. This is to build tough, durable wheels and going with 190s is a waste of money plus adding a little more fragility to the hub. If you want to spend money like that, get Chris King or Alchemy.

DT hubs build up to fine wheels for tens of thousands of riders.

They will be fine for you.
This is not to say that Alchemy or Chris King might be stiffer.

Using DT190s is really weird on Nemesis rims. 11.4 is 100% correct in his advice.

The hubs are a given. I already have them and paid 240 prices for them. Agree that full price 190's are a joke.

Would a Major Tom be a better bet?

I think what everybody is getting at here, is that the only reason to use 190 hubs would be to build a light wheel.

While the Nemesis rims are excellent, they will never build into a light wheel.

Ditto for the Major Toms, which I rate lower on the quality scale than the Nemesis.

If you already have the hubs why not. Nemesis are great riding rims. Depending on the use you plan for them you can also put fancier spokes like CXRay to build a pretty light set.

I have two pairs of nemesis that Derelk@wheelsmith built for me, the first one uses Royce hubs and ACI spokes and is the bombproof set. Used it in Paris Roubaix last year for example. The second set uses records hubs and CX Ray and came in at 1520g IIRC.

Do you have an online source for Sapim D-light? Also interested to buy CX-sprint as a more robust alternative to CX-ray for DS application..

Ok, last post before I commit to building. Will it be stiff enough?

Me: 70kg, using wheels for racing, climbing. They need to be stiff!

Rim: Velocity escape 24f/28r
Hubs: BHS hubs
Spokes: CX-Ray
Nipples: Alloy

Should come to around 1300g, but will it be stiff enough for me when I'm standing on the pedals sprinting?

Depends how how power/torque you can generate. Those BHS hubs have fairly narrow spacing on the rear add to that your spoke count and the light weight spokes means some flex is possible. Whether it is enough to cause brake rubbing is another matter. I have hubs with similar spacing on a rear wheel (different flange diameters though) 28 Sapim lasers and a DT Swiss RR415. I am 80kg and when standing up climbing there is a litle bit of flex but it not a noddle either. So you probably will be O.K but some flex is still possible.

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I the U.K shops just order from Chickens cycles. CX spirints would be a special order over here. Given CX-rays are used in some downhill MTB builds I don't think the CX-ray spoke is bad one for cyclocross. Depends on the stiffness of the rim and the hub flange spacing/diamters though.

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I see. In a sprint, I can do around 1400W. However, I'd be more concerned with it flexing at 800-1100W as that's where a lot of punch attacks happen more often. I'm not a pure sprinter. Also, I'm pretty light at 70kg (sometimes 68-69 during races)

I think this build should be fine for you. As mentioned, they don't have the widest flange spacing in the world, but I think that hoop in a 24/28 hole count should be just fine for your weight.

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http://www.wheelbuilder.org

Max recommended tension for the Escape is 105 kg. Combined with the poor DS vs NDS spacing of the Bitex/BHS hubs and conventional lacing, you'll end up with an NDS tension of 45 kg tops. A recipe for loosening nipples, and breaking spokes.