I had a 205/50 (winter tire) and a 225/45 summer tires both 17 inch test fit on focus SVT rims (same offset as our factory rims) and they both rub at full turn going slow.. the 205 just rubbed in the front and the 225 rubbed enough to take the paint off the first test drive LOL
could be made to work with a different offset or running a set of spacers. I only test fit on the front and did not try the rear as I saw no point and went and got snow tires that fit the car better and will look into summer tires in a few months as we get closer to Spring up here
leaning towards staying with 17 inch as stated before not much over all weight savings going to 16 inch as the tire weight eats up the weight difference between the 16/17 inch rims and I don't like the sideway flex on my winter tire(195/55/15) yes I know its tall and light weight sideways so it leans a lot in cornering .So ill stay with a 40 series for track events and such.. I did find though a 15 inch OZ rim and a BFG rival tire 225/45/15 would shave off 12 lb a wheel over factory rims and lower the car about a 1/2 inch or so ... though that is 2 sizes smaller and will bump you into a different class in AutoX... just sayin