Looking for recommendations on single-bolt, center pull brakes. I have Omega X’s on one bike and will use these for front brakes on the next build. I love how easy it is to adjust the spacing for different wheels.
But I’m looking for a rear brake that is lightweight but still easily adjustable. And hopefully cheaper than Omegax? Thanks.
I think you are stuck with the TriRig. TRP has some options, but I think they are heavier or require dial post mounts and/or a cable hanger. If you really want to lose weight, you could remove the cover and magnets, get Ti bolts, and use the Nokon or similar cabling.
Sorry but I just can’t resist:
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I’ll see and raise 
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Omega X is your best bet. Trust me, I’ve looked high and low for (available) alternatives. Cane Creek makes a single bolt version of the EE brake which, from a cable routing perspective, is sort of center pull and they’re quite light but they are not cheap.
They are not cheap, but if you want super light and great power and control, I can highly recommend eebrakes.