[tyaremko]

Recently bought a 2020 m340i xDrive and it came with 19" stagered wheels with 255/35r19 in rear and 225/40r19 in the front. Before ordering winter wheels is there anything I need to know. I want to go down to 18'' for my winter set so do i just go 255/40r18 and 225/45r18, if so what are the exact wheel specs that are needed, width and offset for the front and rears.
I noticed the BMW 796M wheel comes in 18x8.5 et40 and 18.7x5 et25, is this the spec i want

Also where is the best Place to order OEM bmw wheels in north America