As per my previous post, I learned at my expense that not all 17" wheels fits the X1 - Take care about this!!! Wheel specifications like offset, bolt circle diameter, width are not enough. My wheel Beyern Five are 17x8J Offset 30 5x120 hub 72.56mm look like a perfect match for the X1. However, the X1 has a very tight rim wall - brake calliper clearance for 17in wheel. Hence you must make sure about the center of the hub to top of brake calliper distance. This is the most "unpublished" important information if you want to fit aftermarket 17" rims on the X1. rsracing.com has a very good explanation. I hope this is usefull for you guys.
https://www.rsracing.com/tech-wheel.html