My 2015 3s came with 18" wheels. I'm thinking of getting a winter set of tires/wheels and was wondering how low I can down size the wheels to. I'm pretty sure 17" will clear the brake calipers but will 16" work also? I know the 3i comes with 16". Do both models use the same brake components? If so then I think I can get away with 16". I don't need the winter set to look flashy, just functional.