Originally Posted by
urbanknight
True. It's usually what the manufacturer recommends for the rim, but Park Tools also has a general range and a rule of thumb I go by if I can't find manufacturer specs is 100-110 kgf for non-eyeleted rims and 100-120 kgf for eyeleted rims, with the non-drive side being about 60-100% of that depending on dish.
As an addendum - the left side tension is whatever it is once the wheel is in dish and the drive side is up to 'spec'. As long as it's even and the drive is up to spec then it's fine.