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Did some searches but couldn't find any discussion of this specific concern.

Given the fixed orientation of the spokes in a straightpull hub, how concerned should a builder be with the shift in spoke angle when lacing the straightpull hub to an asym/offset style of rim?

Some offset rims have pretty significant offsets of 4.5mm or more. Compared to a center-drilled rim, the change in spoke angle with a 4.5mm offset is ~ 1 degree. FWIW, you could encounter a similar difference in angle if comparing a 26" rim to a 29" rim.

My conclusion is that one degree change in the spoke orientation isn't enough to meaningfully impact the wheel structure . . . ie, no more likely to cause fatigue/failure where the spoke exits the hub.

But curious in the opinions or experiences of others.
 

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The offset is there to make the DS and NDS cone angles more equal. What you gain on one side you lose on the other. In the rear with a standard rim, the NDS cone angle is much more than the DS cone angle. The offset decreased the NDS cone angle in increases the DS cone angle making them closer to equal. Some rims have angled drillings for DS and NDS. Some don't. The hub holes may constrain the base of the spokes, but they certainly are constrained in J bend hubs too. Spoke crossing also alters the angle of the spokes at the hub flanges. It's nothing I've worried about.
 

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Just like a j-bend hub, lace, then gently push the spoke where it exits the hub socket to the "proper" orientation. In most cases, a straightpull hub will already be there, unless you have a massive offset (like two-row fatbike wheels)
 

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Think about it this way, the same hub is used for 26", 27.5" and 29" wheels. The spoke angle variation between different wheel size is way bigger than the variation caused from asymmetric rims, so you don't need to worry about it.
 
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