I swapped out the 18" RTF's with Pilot SS A/S a couple of days ago. It makes a big difference on bumpy roads with speed humps or potholes. But otherwise, the difference on daily driving is insignificant. My car is F10 535i. I guess the more powerful 550 can take more advantage of the better traction from Pilot SS.
I don't think it's necessary for me to have a spare for daily driving. But I do keep a tire repair kit and an inflator in the car. I might put a spare in the trunk if I need to take it for a long trip.
Last edited by iwinit; 02-04-2012 at 09:26 PM..
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