Can the spare tire on the RDX be replaced with a full-size rim and tire and still be installed?

My spare tire from 2019 has never been used [I want some peace].

Can't install it, the spare tire is quite small, suitable for emergencies only. 😁

[Grin]

I'm curious why it doesn't fit... Theoretically, the outer diameter should be the same, right? Is it just thicker than the original, making it more likely to scrape the bottom?

It should be fine. The one he has is an 18-inch one that's suspended below, so it should work.

Unable to install.

Me too, I want to know.

The original spare tire location doesn't fit, you can just throw it in the back.