Looking at the new PSC full width front bumper. I've got the 17 Rubicon springs, but I'm sure there will be some ride height sag anyway. How much can I expect?

 

Are you planning to put a winch on the bumper? Determining spring sag is difficult because there are so many different spring rates that these Jeeps come with from the factory but you shouldn't notice a crazy amount of sag. If you do, grab a set of spring spacers to bring your Jeep back to level

 

#17 springs are on the lower end for 4dr springs, so you can expect significant sag maybe not immediately but within a year or so. Factory springs are designed for a good onroad/Offroad ride but not to carry the extra weight of steel bumpers and winches.

 

I don't have plans for a winch. Yet.

 

fully armored (see sig., no winch at the time) I saw approx. 1/2" sag up front and 3/4" out back on the stock Rubicon springs... no idea which springs I had but this is on a 2dr.
So, I would guess with just a front bumper... 1/4" - 3/8" at most up front.

 

With bumpers, winch, sliders, & fenders all in steel I lost 1.5" to 2"'s on the factory springs on my JKU Sport. I had 1" to 1.5" of travel before I was on the rubber bump stop.