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A) Great tire. In fact I think the Pilot Super Sport is the best summer tire out there. I run the 205/45/17 on my F56 and the 255/35/18 on my E46
B) I'd say 205/40/18 but they don't make a Super Sport in that size. There is an all season version in the A/S Pilot Sport that comes in that size however, Tirerack data show it performs almost as well but I've never tried it. (I live in Vegas, what would I do with an all season tire?)
C) 215/40/18 is the smallest 18" Super Sport. It will work on an 18x8 rim ... just not sure how the added height/width with work with the rim on the car. I'd worry more about rubbing then the small amount the speedo would be off.
What michelin Super Sports can i get for 18x8s without having speed issues, or the speedometer being off
What size tire are you running now?? If your new tire diameter is <5% different, I wouldn't worry about the speedo error. Our cars generally read high on the speed anyway due to various reasons. I know my speedo is always 2 mph high vs any of the many radar speed signs around my area.
How do those 4s sports hold up? I really do not want to spend almost 300 per tire.
So I kept with 17" x7.5" wheels and was able to use the 215/45/17 which I just checked on tirerack for $184. I don't know how, but I actually paid $159 a tire. I see now it was an exntremely good deal for $159. Performance wise, they are above and beyond anything else I have ridden on. They keep traction on both wet and dry pavement in just about all situtations except the most determined burnouts (read me accelerating too quickly). Otherwise, I created some pretty heavy lift-off oversteer in a downpour situation doing felon speeds around a turn once. (as you can see I was pushing the car far beyond its limits, and it still grabbed hard and corrected easily after the slide. In terms of wear, I can't really tell you. I had Michelin AS 3+ before, and they only lasted 25k miles despite lasting more than 45k on my SOs car. The difference I believe came down to the fact that I was constantly reaching above the limits on the AS 3+, and one thing that absolutely kills tires is burning them up. At this point, I have just over 7k miles on the PS 4s and honestly, they look like they will last at least 3 times this, having only lost a mm, the last time I checked. If I get over 20k from them, I will be extremely happy; there is a chance I will get slightly more.
TLDR: They are great and in my size, super sticky, and were cheaper than most alternatives.
EDIT: I see you have 18"x8"s, you should be able to get away 225/40/18 and tireracks cost for that is $198. Are you in the US?