Push in the SB rule

[brizzypare]

When it's folded around to you in the SB, I've read many places that's it's profitable to push with any two cards given certain conditions. What criteria do you look at when pushing in the SB?

I usually 2-, 3-, or 4-table, so I almost never have great reads on people. However, I play at the $30 buy-in level, so I usually assume the BB is a "resonable" player who won't call me with Q3 or J5.

My main question is about YOUR current stack size. How small does your stack have to be to make this a good move? Currently, I'm drawing the line at 8 BB, but I think this might be too much. Is 6 or 7 BB better? Or maybe if your stack is 10 BB it's still a good play. I'm not sure. Can someone give me some clarity here?

[FishBurger]

I use 5-6 BB before I push any 2, but I don't know if that's mathematically correct.