ThinkingAboutIt wrote:can we change tire/steel rims on the EX for winter tires? if so, to what?
I didn't investigate the steel wheel option, but hopefully, other members can comment.
ThinkingAboutIt wrote:I really don't care about the cosmetics of tire size if there prices are cheaper in difference sizes
Yes, in general, tires with a smaller diameter are less costly. For example, a 17" tire is generally cheaper than an equivalent 18" tire. That's why I myself opted for a 17" winter setup. (more about this, further below)
ThinkingAboutIt wrote:the only company I found that makes 18 inch winter tires is Yokohama or Nohean (sp) and I will need to get them shipped in from Edmonton
Don't know if you meant Nokian (?), but many brands are available, depending upon size (e.g. 17" or 18"). Another advantage of going to a 17" fitment is that there's more tire choice because (again, generally speaking), any manufacturer will make more size varieties of 17" than 18" tires, within any particular line of tire.
I've used Toyo tires on my Audi's and Subaru's for many years and found them to be an excellent value in terms of high traction, low noise and high durability. One of their "claims to fame" is their use of embedded walnut shell shards to provide enhanced ice traction in an environmentally friendly manner - visit their web site to read all about it.
From what you said, we have the same factory setup - optional 18x8 wheels shod with 225/55R18 Dunlop SP Sport 7000 A/S tires. For my EX, I ordered the Toyo "Observe G-02 plus" in a 225/60R17 size and got a good deal on these Tesla wheels from FastCo. When I get them mounted/installed, I'll post some pics.
If you ever change the tire size or even brand, away from the factory one, you need to verify a compatible size to maintain accuracy in your speedometer/odometer and any number of other hi-tech features that depend upon imputed vehicle speed. The most accurate way to do that is to look up the "revolutions per mile" (or "per km") figures published by the tire manufacturer.
The OEM Dunlop tires are rated at 746 revs per mile, while my chosen Toyo tires are 744 revs per mile (465 revs per km). People have different opinions, but generally, within 1% is OK, so in this case, about 7.5 revolutions. Since these tires only differ by 2 revs in a mile, it's a good fit. BTW, 2 fewer revolutions in a mile means I'll be going slightly faster (0.27%) than the speedometer reading when using these winter tires.
Here's a quick link for tire size calculations.
Lastly, I was considering what to do about TPMS sensors, but as I said in this thread, decided to forego them and just tolerate the warning light (or pull the wire that lights it, if it's easy enough to locate/do).
HTH,David