I have the same set sizes 225/45r17 front, 255/40r17 from what I read into it you will need to check with your insurance and if car is on finance with BMW with them as when I checked with them the they stated tyres must be of same tech spec so same size.
I was going to go for the falkens but on event tyres just worked out about £100 difference for the contis so might just go up to these since they are getting such good praise.
In past used Dunlops but as they are impossible to get in the above sizes its not an option any more
Either way removal of runflats should help a great deal with the ride. Personally I would stick to what sizes you currently have.
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F30 335i M Sport - now departed
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