[JazzleSAURUS]

Happy to help, I do my best!

Offset is the distance from the hub, (where the wheel contacts the brake rotor,) to the centerline of the wheel.

That means that a +35 8" and +35 9" wheel will fit differently, because they have the same offset (distance to the wheel centerline,) but it's an inch wider, you're gaining a half inch out towards the fender, and a half inch in towards the suspension.



The bigger wheel you get, the shorter you have to make the sidewall for the tire to match, or get close to the OEM OD of your wheel and tire package.

Example, 'same' tire size, (both 215/45, like the stock tires,)
but one is for a 17" wheel, one is for an 18" wheel. https://imgur.com/a/bmb7o

Conversely, here's a 'same outer diameter' (OD) tire size, (215/40-18) which is about as close as you're going to get: https://imgur.com/a/qqRng

The way a tire size works is thus: width/aspect ration of the width - wheel size.
So you lose 5% of the sidewall to keep the OD the same.

Hope that helps, let me know if you have any more questions, I'll do my best to help.

(Link to the tire calculator I use so you can play around, and get a visual ideal of how wheel/tire effects both aesthetic, and aspect ratio: https://tiresize.com/calculator/ )