I won't attempt to answer your question because I can't. But I'd like to ask a question: Why downsize? Why not run exactly what the engineers designed?
Sure.I have heard good things about PMC. Which tires did you go with and would you share the total cost?
Oh I used them too. I was thrown off by the trim level because Touring is the top trim south of the border. They said 225/65/16 will fit their premium trim which looks similar to the Canadian touring trim.As mentioned Tire Rack and I believe Discount Tire have great calculators. Put in your car information and it will give you Winter tire and wiynter wheel recommendations. I'm more familiar with Tire Rack, which includes customer reviews, and for some tires, Tire Rack comparison reviews
It is very possible that losing an inch of diameter will interfere with the caliper.Just make sure that the diameter of the 16-inchers match the diameter of the OEM wheels as closely as possible. You won't run into wheel well interference issues that way and your speedometer will stay roughly accurate. Unlikely that going down one inch in rim size will cause brake rotor or caliper issues.
There are many tire size calculators on the web to use comparing diameters.
Continental - WinterContact SI - P225/60R17 XL 103H BSW SKU: C1539063 Four for $663.32
Tire & Wheel Mounting SKU: pmc-assembly (includes balancing) no charge
PMC Steel Wheel Black wheel | 17X7, 5x100, 56.1, 48 offset
SKU: PMC_750000_X41757&&valve Four for $278.76
Shipping: no charge
Rebate from Continental Tire: $65 prepaid Visa card