We use them in our semi steer tires, hard to say for sure if they help, our roads are pretty rough. First time the tire shop put them in, they just tossed the entire bag in the tire when mounting it, they never told me they did that and when I got out on the highway the bag hadn’t broken open yet and it shook something awful. I took it back thinking they had mounted something wrong, that’s when they told me what they did. For people doing a lot of slower driving I have concerns about the beads wearing away on the inside of the tire, I know on the semi tires there is definitely black powder inside when you take them off.