Will there be any difference in stiffness between CX rays and lasers?
not really
Do spokes even effect stiffness?
yes but I guess you want a lightweight build.
Is it a track hub rear? what is the flange spacing? Symmetrical?
standard answer: thicker spokes on rear drive side (/drivesides) maybe cx sprint, and then cx ray on the rest
Double fixed rear hub so symetrical flange yes. Does this mean cx sprint on the rear both sides or just cx rays all round?
If it's symmetrical I can't see any benefit in using different spokes on either side. Using CX-Rays on one side of a 24 hole rear wheel will only save you 12g compared to CX Sprints all round.
@Turkish started
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not really
yes but I guess you want a lightweight build.
Is it a track hub rear? what is the flange spacing? Symmetrical?
standard answer: thicker spokes on rear drive side (/drivesides) maybe cx sprint, and then cx ray on the rest