Offset?

[Powlab]

Hi, I had a question I was hoping someone could answer. I recently bought Falken Wildpeak A/T3W 315 70R17 and black rhino primm wheels 17” with no offset. Should I have gotten the -18mm offset? I’m still learning so please be nice. 2018 JL Rubicon on stock suspension. Will it work with 0 offset? Any help is appreciated!

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[77RRAD]

Your tread will stick out past the fender about 1 inch.
( tread not the buldge of the sidewall )
If you went with -18 it would stick out another 18mm.
Yes the 0 will work.
I run a +25 which sets the tread flush with the fender and I run a 2 inch lift on 37s

 

[dragoneggs]

I’m currently running 315/70-17 on zero offset wheels on my JLR. I am very happy with a little poke vs. OEM. Did also install fender flare extensions to help cut down the spray on the rear fender and the doors.

 

[LOBBS]

Since you're new, I'll go gentle. It's one of my major pet peeves when conversations about offset don't also include the width of the wheel in question. Because offset is an irrelevant number without that.

In your case, we are assuming that the 0 and -18 offsets are just two different fitments of otherwise identical wheels? If that is true, then yes the wheel with the -18 offset would poke about 3/4 of an inch further than a wheel of the same width with a 0 offset.

A 17x8.5 wheel with a zero offset is a pretty common Jeep fitment. Most lifts have a requirement for 4.5-4.75" of backspacing to clear them so most aftermarket wheels target that number. Backspacing is just a different, older way to call out the location of the mounting face relative to another surface. For backspacing, it is the distance in inches between the mounting face and the inside edge of the wheel. Offset has become more common these days and it is the distance in millimeters of the locating face relative to the centerline of the wheel. This is why offset is irrelevant without knowing the width of the wheel. Without the width, you can't figure out the centerline.

So, let's look at our 17x8.5" 0 offset wheel. The actual width of that 8.5" wheel is closer to 9.5" when you add the bead on the inside and outside. Knowing the offset is at 0 or dead on the centerline we can divide that 9.5" in two and that gives us the backspacing at 4.75". Let's say for the sake of demonstrating how offset moves with width that we want to maintain that same backspacing to stay compatible with our lift. A 9" wheel (10" total width to the outside of the beads) would need an offset of -6 to keep that backspacing. 10"-4.75" means we have 5.25" of front spacing. There's a half inch difference now between our two depths or an offset of .25" from centerline or roughly 6mm. A 10" wheel would need a -19 offset to maintain 4.75" of backspacing by that same math. But now we have three different wheels that all fit with the same clearance to the inside (backspacing) but have three very different offsets due to changes in their width. Anyhow, off my soapbox when it comes to offset and how far too many people leave off half the necessary information when talking about wheels.

In your case, it appears that the Primm is a 17x9 wheel with 5.00" of backspacing at the zero offset you ordered. This could be an issue depending on what lift, if any, you choose to do with in the future. As mentioned above, 4.5-4.75" is a fairly common requirement with a lot of the more popular brands of lift. The -18 offset on the same 17x9 puts you at close to 4.3" and for sure would clear most. So, what lift do you have or which ones are you looking at? With that we can give you a more definitive answer on which of those two fitments may better serve you.

 

[Powlab]

Since you're new, I'll go gentle. It's one of my major pet peeves when conversations about offset don't also include the width of the wheel in question. Because offset is an irrelevant number without that.

In your case, we are assuming that the 0 and -18 offsets are just two different fitments of otherwise identical wheels? If that is true, then yes the wheel with the -18 offset would poke about 3/4 of an inch further than a wheel of the same width with a 0 offset.

A 17x8.5 wheel with a zero offset is a pretty common Jeep fitment. Most lifts have a requirement for 4.5-4.75" of backspacing to clear them so most aftermarket wheels target that number. Backspacing is just a different, older way to call out the location of the mounting face relative to another surface. For backspacing, it is the distance in inches between the mounting face and the inside edge of the wheel. Offset has become more common these days and it is the distance in millimeters of the locating face relative to the centerline of the wheel. This is why offset is irrelevant without knowing the width of the wheel. Without the width, you can't figure out the centerline.

So, let's look at our 17x8.5" 0 offset wheel. The actual width of that 8.5" wheel is closer to 9.5" when you add the bead on the inside and outside. Knowing the offset is at 0 or dead on the centerline we can divide that 9.5" in two and that gives us the backspacing at 4.75". Let's say for the sake of demonstrating how offset moves with width that we want to maintain that same backspacing to stay compatible with our lift. A 9" wheel (10" total width to the outside of the beads) would need an offset of -6 to keep that backspacing. 10"-4.75" means we have 5.25" of front spacing. There's a half inch difference now between our two depths or an offset of .25" from centerline or roughly 6mm. A 10" wheel would need a -19 offset to maintain 4.75" of backspacing by that same math. But now we have three different wheels that all fit with the same clearance to the inside (backspacing) but have three very different offsets due to changes in their width. Anyhow, off my soapbox when it comes to offset and how far too many people leave off half the necessary information when talking about wheels.

In your case, it appears that the Primm is a 17x9 wheel with 5.00" of backspacing at the zero offset you ordered. This could be an issue depending on what lift, if any, you choose to do with in the future. As mentioned above, 4.5-4.75" is a fairly common requirement with a lot of the more popular brands of lift. The -18 offset on the same 17x9 puts you at close to 4.3" and for sure would clear most. So, what lift do you have or which ones are you looking at? With that we can give you a more definitive answer on which of those two fitments may better serve you.

Thank you for all the information. I apologize for not including the width of the wheel. Right now I have the stock suspension, no lift plans for awhile. If I do decide to lift it eventually I probably wouldn’t go more than 1.5 or 2 max due to being vertically challenged (I’m 5’2”) and no brand preference in terms of a lift.

 

[Powlab]

I’m currently running 315/70-17 on zero offset wheels on my JLR. I am very happy with a little poke vs. OEM. Did also install fender flare extensions to help cut down the spray on the rear fender and the doors.

Thanks for the pictures! Looks great! Any issues with rubbing?

 

[RAO]

Since no one has jumped in with this thus far, try using this:
https://tiresize.com/wheel-offset-calculator/

You can enter your existing wheel and tire combination and your planned tire and wheel combination to see the difference.

I used it when shopping for new wheels and tires and found it to of great help.

Good Luck!

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