Quote Originally Posted by tom4bren View Post
"These LTZs have some slight grooved tread within the treadblocks"

If I understand what you've described, it's called Siping (sp? - pronounced like pipe).

That gives you improved performance on dry pavement (I guess slick rock too). It won't help with anything else. They try not to use it too much though since it tends to make the tire wear faster.
Yeah, I guess it could be called siping, but it's on the recessed part of tread, not on the tread blocks that directly touch the ground. It has plenty of siping on the shoulders but I can't recall ever seeing a tire with it on the recessed part of a tire. I know the siping is for increased traction as it torques under pressure and opens up additional space to bite the surface. Not mud of course.

Road noise seemed absolutely minimal, even with windows open. I was a bit surprised. Had a very smooth highway ride. Have them at 40 psi, but am increasing them today and will see what differences I notice.

And when it gets really muddy around here, we use Dave's FJ with these bad boys.