Good to know the Michelins solved the vibration issue.+1 on the Michelin Defender LTX M/S2 .
I went the 119 load rating because my plan is to tow so I wanted the 10 ply and extra sidewall strength over the 115, although the cost difference between the 115 and the 119 gave me significant pause.
The stock Pirelli rubber on the 22's IMO was a performance oriented decision by Rivian with a real soft compound. I only got 15,000 miles on the rubber (with rotations) before I was down to steel belt on a couple of the tires. I do a fair amount of freeway driving, so I suspect the camber at lower ride heights didn't help my tire wear situation. Plus I was never happy with the balance of the tires which would start to vibrate above 65mph ... I was advised by the service center that they could only balance the wheel to 80mph which meant that (for me) I got vibrations at around 65mph. Not sure where the truth on the balancing lies, but it never worked for me.
Since switching I'll say that I'm enjoying the Michelin Defenders so much more than the Pirelli. With the Pirelli's I think the soft compound contributed to off center tracking on camber and road undulations to the point where it was annoying. The Michelins seem to hold a line better, and are much better balanced via the Discount Tire install than the Rivian OEM install.
My use case being 85% paved and 15% unpaved roads, so with that and the reasons above, I think I made the right choice.
who did you get to install them?+1 for the Michelin LTX MS2 115H. Smooth ride and cornering. Second and third on my list were Continental TerrainContact HT followed by the AT. The 70k treadwear warranty and prior warranty experience with Michelins closed the deal for me.