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Hello and welcome to JustAnswer BMW,

My name is XXXXX XXXXX it will be my pleasure to assist you today.

yes, that is okay. these are factory approved wheel sizes.

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Not if the proper sixed tires are used (in owners manual) which would maintain the rolling diameter at each corner. The car would not even know anything had changed at all.

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CORRECT, if you use the proper tires

strictly speaking, a coupe 335xi is only supposed to go to 18, sedan 335xi to 19

but, 19s can be used on the coupe, just need the proper tires

again, I will repeat myself, there is no way whatsover for the car to know because the rolling diameter at each corner of the car will remain exactly the same as the current wheels/tires he has if the proper 18 or 19" tires are used .

all you are doing is going from small wheel, big tire to big wheel, small tire.

the total diameter/circumference, which is what the car can sense, remains 100% the same

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I would use 18.

225/40 on the front

255/35 on the rear

I like Toyo and Kumho brand.

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you can use run flat or non run flat

I would use non run flat.

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you are welcome

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