You're in Edmonton so I assume you have your fair share of potholes in spring... plus you may slide into a curb and damage those nice wheels. Long story short the 19" wheel will give you more tire choices, a smoother ride for rough icy roads and may even result in less ice/snow buildup on the wheel that could potentially give an out of balance condition. Plus it's not good for tires to be mounted & unmounted every year, it's better to just swap wheels with winter tires on them already.