Ans1: When the drive sides averages 110 kgf AND the wheels is true AND the wheel is dished...after a final stress relief cycle...
...you're done.
Ans2:
Most modern day alloy rims of basic box, semi-box and aero design are rated for 100-110kgf. Some can actually take more - but isn't covered by warranty. Some tensionmeters such as Wheelsmith's include the caveat not to have an average that exceeds 120 kgf. Some but not all paired spoke rims are rated for 120-130 kgf. Many carbon rims regardless of lacing arrangement have a 130 kgf average ceiling while I know of one that has a max of 80 kgf.
Be aware that some manus purposely set the limit low on their alloy rims to preempt warranty submission - even though many of us wheel builders know what their rims can really handle. I think it's dishonest - but then again - manus have a right to set their terms. Customers have a right to buy or not to buy. It's as simple as that...
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life