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Yes was planning on 2x all round. For strength and I prefer the aesthetics. So do you think for a light rider I'll need stiffer spokes than cx rays on the rear for 24 holes?
Turkish-
Does this mean cx sprint on the rear both sides
yes I would do that :)
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Not sure, TBH. I've never build a 24h rear wheel with a shallow rim - the shallowest rim I've used myself on a 24h rear wheel with CX-Rays is a Kinlin XR31T which is pretty stiff. I suspect you'd be fine with CX-Rays, but I'd defer to more experienced wheel builders.
I built @Cycliste a rear wheel using an XR200 rim, which is light and quite floppy, and used CX-Rays on that but I used 28 spokes on the rear despite @Cycliste's feathery lightweightness. That was fine until a 6'1" chap called Alan rode over it after @Cycliste had gone over the handlebars. Wasn't so happy after that.
svenhöek
Brommers
No. The stiffness of the spoke will depend on the Young's modulus of the material used and the cross-sectional area of the spoke. All steels have essentially the same Young's modulus (particularly as all steel spokes I'm aware of are made from 18/8 stainless steel or similar) so the only thing that will change in terms of spoke stiffness is the cross-sectional area. CX-Rays are just flattened Lasers, so will have the same area in cross section. If you want stiffer spokes then you're going to need either a different material (impractical) or a chunkier spoke (like a CX Sprint rather than CX-Rays).
Oh, and I'd recommend not lacing the front wheel radially if you're using Mack hubs. 2 cross front and rear.