I'm looking to buy 16" Blizzaks for my A4 and I don't know which non-OEM sizes will work, and which will throw off my speedo. TIA.

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Let us know what size and myself or another member can let you know if they will fit.

snow tires could be wider and thicker than normal passenger tires.

Although I was under the impression that most winter tires are actually slightly narrower than other-season tires. Not sure where I've read that though...

You will definitely want a narrower tire on your winter tires than on summer. If your climate is sufficiently nasty to get winter tires, then there's no reason to even try for 50 aspect ratio option.

Get the 205/55/16 and be done with it!

Not that you asked...but according to TireRack users, the Dunlop Winter Sport M3 outperforms the Blizzaks in every category...and it's $30 cheaper per tire.

Good luck!