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· Premium Member
2018 X3 M40i / 2016 X3 xDrive35i
1,548 Posts
Those are really small tires. 245/50R18 is the same rolling diameter as stock. 245/40R18 is 7% smaller than stock, your speedo will be quite a bit off, and your spare tire will be incompatible with use should you need it.

They are also likely to look really weird with no suspension modifications.
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