Snow tire size

[brick8]

I need to buy snow tires for my 2010 XC70 T6 and was wondering what is the best size for the vehicle. It came with 18" wheels but I am thinking of going with either 16s or 17s for the snows.

[brick8]

I need to buy snow tires for my 2010 XC70 T6 and was wondering what is the best size for the vehicle. It came with 18" wheels but I am thinking of going with either 16s or 17s for the snows.

After a lot of research, I ended up buying Blizzaks, size 235/55R-17, mounted on alloy wheels from tirerack. I would have preferred steel wheels but they were sold out.