New to winter tires

With regard to the tire pressure system, do I believe your Canadian GLK (like ours) have the "Tire pressure loss warning system", which is quite different from the US TPMS. It's principle is very simple, reliability questionable during normal driving conditions - and even worse in winter and during other conditions. Note page 222 in the GLK Operator's Manual: http://www.mbusa.com/vcm/MB/DigitalA...l/2010_glk.pdf.
So any time being mindful of it's limitations is important.
How do I choose the tires that will fit the 2011 20" stock rims, and choose the right size rims that will fit the stock tires?
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