Originally Posted by CHCCubs
The E90 uses 225/45/17, while the F30 uses 225/50/17. The difference will throw off the speedometer by about 4%. In my case the previous winter tires were pretty much worn down after 4 seasons of use, so between that and the tire size difference, it made sense for me to get a new set.
Thanks CHCCubs for the tire info reply. This is reassuring as I am going to keep my old winter tire pkg for my new F30.