Why do you want to change your original German BMW rims for fake Taiwan rims?? Do you know that your ori BMW rims worth a lot more than those fake rims?
West Lake is one of those low budget China tires! If you look at these branding category below, it's even lower than Economy class tires, basically the lowest category similar to Linglong and Winrun! Are you still considering this because you still want to upgrade to 17' rims but with just your very low budget?
http://www.tyrereviews.co.uk/Tyre/

Please read this review, the top of the line West Lake finished LAST in the test and mentioned as "scored zero points in wet braking and were deemed too dangerous to use on the road."
http://www.tyrereviews.co.uk/Article/2016-...r-Tyre-Test.htm

Hahaha, as I already suspected and mentioned in your thread, they will give you such crap tires to fit your budget!