To fit these tires on an 850, you need to do one of two things. One option is a rack limiter to prevent rubbing at full turn. The other option is widen the track 20mm via a big brake kit or wheel spacers. If you do not, you may experience light scuffing at full lock. S70s will have no problem with this tire in 215/40/17. These tires also have a lower load rating than OEM. For this reason I would not recommend them to anyone with a station wagon, or anyone who freguently drives at full load capacity.

P-Zeros are one of the stickiest tires on the market. The 205mm series tire actually has a tread width equivalent to a 215. A major complaint that is common with these tires is their life span. If correctly inflated and not abused, P-Zeros will last a long time. I was able to get 25,000 miles off of my set before they required replacement.