I should note that we were able to take Rubicat out for a quick spin and so far, here are our initial thoughts on the Cooper STT Pros.
1. They are a LOT quieter than we were expecting. I think being that our Renegade is a unibody, the sound from the tires translate into the cab a lot louder than a JK which has a body on frame and separated by body mounts that are really isolators. Of course, on our Renegade, we were moving from street tires to mud terrains and on Rubicat, we went from bigass Mud Grapplers to these Coopers.
2. Surprisingly, they are a lot rounder than I was expecting. In fact, I didn't notice any shimmy or roughness until I got to about 75+ MPH and even then, it was very slight. Based on the fact that I couldn't feel anything in the steering wheel, I have to think that the minor balance issue is on a rear tire. I have to say that it's almost not off enough to even bother getting them balanced but, I think we'll do it anyway just because we tend to drive on the 75 MPH range on a regular basis.
3. Right off the bat, we aired these tires up to 30 psi and being that they are Load Range E tires, we can definitely feel it. At least, we can feel every stone and crack in the pavement but, that's nothing new to us. We'll be bringing them back down to about 26 psi and I suspect that will help out.
I will be sure to post up more as I think about it. If any of you have any questions, please let me know.