My son recently purchased a 2oo9 335I X-drive, he would like to change the wheels to 18 or 19 inches, is that O.K. ??
Country: United StatesMake: BMWModel: 335I X-DriveYear: 2009Engine: twin turbo
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yes, that is okay. these are factory approved wheel sizes.
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When I asked BMW they gave me some song and dance about the fact that changing wheel size MAY change the shifting ratio and the way the x-drive functions, any truth to that ?
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.Please use the "reply" or "continue the conversation" link if you require further information. Otherwise please do not forget to leave a positive rating (far right) so that I may be credited and compensated for my answer, thank you.
So, if I understand you correctly, not only there will be no harm to change from 17" to 19", but the car won't even notice. right?
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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Could you tell me if it was your car, which would you use the 18" or 19" and what kind/size tire we should be looking to buy for the size you would recommend?
I would use 18.
225/40 on the front
255/35 on the rear
I like Toyo and Kumho brand.
One last question : we are talking about "Run-Flat" tires right?
you can use run flat or non run flat
I would use non run flat.
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I'M just curious, since the coupe has no spare why would you choose non-flats?
because they ride / preform better and are usually quieter
you can purchase a compact spare kit to carry in the trunk, or risk needing to call a tow in the event of a flat for how frequent they are.
I have run with no spare before, and my dad has been doing it for years on his 328. flats are pretty rare and a tow is not usually hard to come by or THAT expensive.
I believe I have fully answered your original question (is it okay to use 18 or 19" wheels) but please let me know if anything is unclear
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I just want to thank you for your very valuable information. You have put my mind at ease, look forward to working with you again if I have another BMW question.
you are welcome
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