the offset is important as to how the rims sit in relation to the brake caliper.
Ask your shop to see what offset you had previously. He may be using some sort of universal steel rims, thinking it would not matter.
Originally Posted by erth
my 2011 323i came with 17" 225 45 r17 91h.
so my issue is going to a 16" steel rim for winter tires. i believe the 16" rubber is less expensive and will work better in winter driving.
is the offset of 31mm the important part of the equation?