9663mu

Thinking about getting pro comp 20x9. With 275/60/20. I just want the wheels to be flush with fenders as I don’t want them sticking out. Any thoughts ? Thanks guys. Appreciate it

Apples

Offset explained:

https://www.tirerack.com/wheels/tech...jsp?techid=101



And on this page, scroll down after entering your tire/wheel info for a graphic depicting where your wheel width will fall in relation to the original setup. This, a tape measure and a straight edge at your truck should give you what you're looking for.

https://www.willtheyfit.com/index.ph...h=8&offset2=10

crankinaway

Backspacing is static and any increase in width of wheel is to the outside based on the wheel width.

Offset varies as the wheel width increases.

https://tiresize.com/wheel-offset-calculator/

Apples

And know too that while you may get the outside wheel lip to fit flush with the vertical fenderline, remember the section width of the tire (the sidewall) may stick out beyond your mark.

Jfabes

20x9 with a +18 or +20 is a popular setup but will stick out just past the factory flares. That’s about as close to flush that you will get with an aftermarket 9” wheel. If you don’t want that, then look for a 8.5” wheel or a 9” with a higher offset (bigger number) if you can find one. Also, keep in mind the tire width as mentioned above.

UNBROKEN

iTrader: (1)

Some misinformation in here...but to simplify it backspace is the distance from the mounting pad of the wheel to the back side of the hoop. It’s not static as mentioned earlier, different wheels have different backspace.
Offset is the distance from the centerline of the wheel to the mounting pad. Positive offset wheels tend to be tucked inside the wheel well. Negative offset moves the outer edge of the wheel further out...the wheels you see sticking out past the fenders are negative offset wheels.
All of this changes from wheel to wheel. A 20x9 +30 wheel will fit the truck completely different than a 20x10 +30.

9663mu

This is really good info guys. Thanks so much

Jfabes

some....

this is not true. A 20x9 with 0 offset (like what I have) pokes about 1.5” outside the factory flare. You do not need a negative offset. In fact, as I mentioned, a positive offset on a 9” rim can poke.

this is partially true...rarely do two different width wheels have the same offset (for the same fitment application), BUT, even if they did, in your example the 10” would only poke 1/2” more (13mm), definitely not a substantial difference.

At at the end of the day, offset is the “needle mover”.