I've got a PowerTap 28 hole rim to lace up to a Nio30 rim. On my DA hubs with 44mm flanges, the spokes will clear the heads with a three cross pattern. But it looks to me like a 70mm flange will be too big and the spoke will cross over the head. I think this is particularly bad with PT since the spoke holes are not countersunk very well.

Anyone actually done one of these and know for sure. I'm leaning now toward 2x/2x.

Oh, BTW, I'll be using CX-Rays if it matters.

Thanks!

I don't know if this helps, but the manual reads "use at least a 2x pattern on the non-drive side or you will void the warranty"

Use 2x both sides. Even on my 32h, 2x works better. But both of mine are the SL, so the old Pro hubs may be different. I can't remember.

You can do 3x but I personally like 2x better.

Here is picture of 28h 3x with silver cx-rays.
<a href="http://www.flickr.com/photos/ligerowheels/404073790/" title="Powertap SL 2.4 by ligero_wheelworks, on Flickr"><img src="http://farm1.static.flickr.com/149/404073790_afbd505a2d_b.jpg" width="1024" height="768" alt="Powertap SL 2.4" /></a>

You can do 3x but I personally like 2x better.

Here is picture of 28h 3x with silver cx-rays.
<a href="http://www.flickr.com/photos/ligerowheels/404073790/" title="Powertap SL 2.4 by ligero_wheelworks, on Flickr"><img src="http://farm1.static.flickr.com/149/404073790_afbd505a2d_b.jpg" width="1024" height="768" alt="Powertap SL 2.4" /></a>

Thanks for the photo. This doesn't overlap nearly as close as I thought it might.

Actually, I like your 2x/1x combo a lot too.

I tried 3x/3x on my 28 hole hub and never had much luck with it. It worked well enough and I got decent mileage out of it but still I had more trouble with breaking spokes than I ever had before. Decided to try going 2x/2x and I haven't had it built up long but so far I am happy with it and all things considered comparing it to the previous build it was easier to get the tension where I wanted it and the angle of the spokes looks much better now. Looking at it once I had taken it apart to rebuild it, with the angle at which the spokes were crossing those large flanges on a 3x build, sooner or later one of the spokes was always going to break prematurely.