I have a 2017 ford edge sport. It came with the 21 inch tires which apart from being super expensive also don't give quite the same cushy ride that 18 inch tires with a similar diameter would. I'm finding lots of information on swapping tire sizes and have settled on a target size, 245/60 R18
What I'm not finding much info on is rim dimensions. I believe that rims have a width and an offset. Aside from breaking out the calipers, would that be stamped anywhere on the rim? I'm not looking to change the width of the front or rear axle at all, so I assume both of those measurements are important.
Finally, I assume that since I'd be getting 20mm less tire width, I might need to get a rim with higher offset if I wanted the exterior tire-to-tire width to be the same, but realistically if I matched the offset between old and new rim it'd only be 10mm on either side of the tire, right? So I'd lose 20 mm on the overall assembly, and the tires would be 20mm further apart (as opposed to the entire assembly being 40mm shorter). Can anyone confirm this?
