Quote:
Originally Posted by mmwwhats
I’m in the same boat. I have 245 front and 255 rear winter tires used on my M2 that I’d like to now use on my non-ZTK M240. Would love confirmation that these fit.
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With x drive, the perfect set up would be same diameter front and rear, but within 1% is OK for BMW.
The reason for this is that size differential on AWD puts strain and wear and tear on the system.
I've found Bimmerpost threads (for other models) where owners who claimed they kept tire sizes within range had xdrive failure around 50k miles.
The standard tires for non-ZTK and ZTK is less than 1% (.8 of 1%)
This
LINK is a tool that enables you to enter different tire sizes to ensure that you are within that 1% range.
Another consideration, as mentioned by XC3LLR8 earlier, is rim width.
Every tire has an "ideal" rim width but also a range that's acceptable.
The best guide for matching the ideal or acceptable rim width to a tire is Tire Rack, as they list that in the specifications for every tire.