Hello guys, I have just returned to the 690ER world after 2 years with a 990 ADV. I had been running MT21 on my first 690, then Scorpion Rally on the 990, and now Scorpion Rally with bibs (foam, no tube) on the 690. Great grip in most situations, no problems on the road at moderate speeds, and no more tubes and tools and pump to carry. I expect ~5000k front and ~2500k rear durability, as I was getting slightly less with the 990.