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Originally Posted by Starz26
Thank you for the clarification.
Is there a good resources to learn how to take ones own measurements and get a better understanding of all of this. I am the type that likes to know they how and why so that these questions can be answered on my own for any given situation.
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If you know the dimensions of the stock wheels and tyres, then this resource will enable you to make quick and easy comparisons;
https://www.willtheyfit.com
By experimenting with the numbers you can quickly extrapolate the relationships between the different numbers.
For example 245/50R19 means the tread is nominally 245mm wide and the sidewall is 50% of the width, and it’s a Radial construction tyre designed to fit on a 19” wheel.
The offset (ET or IS number) is the distance from the mounting face of the wheel to the centreline of the wheel, in millimetres.
So an 8” wheel with an ET of 0 would have 4” of backspace behind the mounting face, whereas an ET of 50 (around 2”) would have a backspace of 6” behind the mounting face.
I’m hesitant to go further - don’t want to bombard you with too much info!