https://www.rimsntires.com/specspro.jsp
I've been using this for almost 2 decades and there are several ways to use it. "Play" with specs below, try different settings, compare results, see difference..."
You can actually go through the site and actually choose your vehicle and in Box 1 it will put the the original specs. So far from my experiences at least in the sense of specific vehicles its been pretty accurate so far. But if you know your specs or just want to compare tire and/or wheel package upgrades. While comparing some recent tire choices, I figured I'd post this up for others to see or use.
It allows you to view wheel offsets, tire size comparisons, and offers many added bits of information such as tire clearances as well as other conditions to consider or pay attention to for modification or alter.