My 2c recognizing I don't own the RX yet... I am going to purchase one in the coming weeks and have driven them both back to back. The 18" wheels did absorb a little more of the road, and you could feel them roll a hint on moderate corners (I test hard) when compared to the 20's. There was certainly a difference, but I have to say noise was almost indeterminate. In all would say it's like comparing two high end SLR's from Canon and Nikon. If you see the pictures side by side, you can tell the difference; alone, I defy anyone beyond a very serious hobbyist or pro to notice. I did expect the 20's to be a bit more harsh, but was surprised when they weren't. You did notice they handled the corners a hint better, and for me anyway they are night and day in terms of aesthetics. I will be getting them, it just turns into if i do this out of the gate, or if I get the lesser optioned vehicle and put them on myself. For 3600, I can sell the 18's for $1K and have them for $2.5K. It all depends on where the dealer is more flexible, but I do know that many dealers will not exchange them unless you do something crazy and give them MSRP or close... I have tried this tactic in the past.

As for the replicas, again, not trying this brand people are looking at, or owning an RX, I will never do it. I have tried this with two different 4 runners and vowed never to do it again. Not replicas, but aftermarket wheels that claimed to be identical specs. I was never able to get them balanced up properly and always had vibrations; even with the first set being replaced. i attributed it to old technology and thought it would be resolved. The latest was the 3rd Gen 4Runner where I felt they should have ironed it out. From my perspective, there is no chance I will do that on a $50K+ vehicle. I know others do it, but with 2 failures for me on Toyota products, and having noticeable issues, I will stick with stock that not only is proven, but also eliminates finger pointing. I tell you guys, it was a major hassle I should have learned the first time. It's easy to sell brand new factory wheel sets and tires on CL, or individually on eBay. In that regard $2.5K for the real deal that is fully covered under warranty is the way to go for me...


BTW, as for snow, with the factory tires, there would be little discernible difference that would relate mainly to tread pattern, and minimally if unoticably on the harder 20" tire. You are relying more on the AWD and snow setting of the RX. Where people go wrong in choosing 20's over 18's is in terms or real off road being mud, rocks, sand, etc. This is where more tire is critical be it flotation, rim protection or more sidewall for traction. And I don't think anyone with an RX is interested in doing that... I'll save that for my Tundra...

 

20 inch factory is great good luck
George