New Rim Advice Sought

[USAFREODRetired]

I'm currently running Mickey Thompson Baja Boss A/T 35 12.5 17LTs on my stock Rubicon rims with 1.75" Spydertrax spacers. LOVE these tires!

Ideally, what would be the optimum rim specs that would eliminate the need for my spacers yet keep the exact same tire positioning? I really like how the current setup looks and drives, but I would like to get rid of the need for spacers with a properly offset rim at an in-spec width.

Thanks!

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[tomk62]

I'm currently running Mickey Thompson Baja Boss A/T 35 12.5 17LTs on my stock Rubicon rims with 1.75" Spydertrax spacers. LOVE these tires!

Ideally, what would be the optimum rim specs that would eliminate the need for my spacers yet keep the exact same tire positioning? I really like how the current setup looks and drives, but I would like to get rid of the need for spacers with a properly offset rim at an in-spec width.

Thanks!

How much poke do you have?

 

[USAFREODRetired]

About the same as the spacers, 1.75", fully covered by EZ Flares XL.

 

[azwjowner]

This is very simple. Stock rims are +44mm offset, 1.75 inches is 44mm, the answer is 0mm offset. That's a very popular offset so you should be able to find plenty of wheels. The width of the rim doesn't matter because it won't change the position of the tire. Something like 0mm offset, 8.5" wide would be exactly what you want.

 

[tomk62]

This might help, check my post in this thread https://www.jlwranglerforums.com/fo...17x9-wheels-on-jl-rubicon.121432/post-2529694

These are 17x9 wheels with -6.35 offset, 4.75 backspace.

 

[dlong1119]

This is very simple. Stock rims are +44mm offset, 1.75 inches is 44mm, the answer is 0mm offset. That's a very popular offset so you should be able to find plenty of wheels. The width of the rim doesn't matter because it won't change the position of the tire. Something like 0mm offset, 8.5" wide would be exactly what you want.

-post below edited due to not being able to math
Offset and wheel width are linked to each other and both are required to calculate where the front and back edges of the wheel will sit. Backspacing is different, but wheel width will still be needed to know where the outside edge of the wheel will be.

The link below is the easiest to use calculator I've found for basic wheel fitment and comparing one wheel to another.
https://marksink.com/tire_wheel_offset/offset.html

 

[Pig-Pen]

If the stock wheel is 44et and 7.5” wide, than the stock backspacing is 5.98”

using a 1.75” spacer, that essentially makes the stock wheel have 4.23” backspacing. So as close to that as possible. If they make a wheel with 4.25” backspacing. 4.5” is the most common spec as it is often required to clear the suspe

You can go up or down. Less backspacing sticks out more and more backspacing sits inward more.

 

[azwjowner]

This is incorrect, as offset and wheel width are linked to each other and both are required to calculate where the front and back edges of the wheel will sit. Backspacing is different, but wheel width will still be needed to know where the outside edge of the wheel will be.

An 8.5" wheel with 0mm offset will stick out 0.5" further than a stock 7.5" wheel (44mm offset) with a 1.75" spacer.

The link below is the easiest to use calculator I've found for basic wheel fitment, you'll just need to manually add or subtract the spacer width from the numbers it gives you.
https://marksink.com/tire_wheel_offset/offset.html

Nope. Because the tire is wider than the rim. He has 12.5" tires. So while a wider rim will physically stick out more, the tire edges are in the same place either way.

 

[dlong1119]

Nope. Because the tire is wider than the rim. He has 12.5" tires. So while a wider rim will physically stick out more, the tire edges are in the same place either way.

I see what you mean there and that is correct in this case since he's essentially running a 0 offset wheel, my apologies. I must have screwed up when adding the spacer back in afterwards and will edit my post above to hopefully avoid confusion.

 

[2nd 392]

This is very simple. Stock rims are +44mm offset, 1.75 inches is 44mm, the answer is 0mm offset. That's a very popular offset so you should be able to find plenty of wheels. The width of the rim doesn't matter because it won't change the position of the tire. Something like 0mm offset, 8.5" wide would be exactly what you want.

I think I got it, presently 35/12.50’s on stock 7.5”- 44.45mm offset the tread is even with the flares. The 8.5”- 1mm.’s I’m looking at would result in .71” poke ? ? Did I learn your lesson ? ?

 

[azwjowner]

I think I got it, presently 35/12.50’s on stock 7.5”- 44.45mm offset the tread is even with the flares. The 8.5”- 1mm.’s I’m looking at would result in .71” poke ? ? Did I learn your lesson ? ?

Not quite. Offset is the position of the center of the wheel. If you're going from +44mm offset to +1mm offset, that's a change of 43mm, or 1.69 inches, further out. The whole wheel moves that far out. Tires are mounted centered on the wheel. The only thing wheel width changes is how much rubber extends beyond the wheel, but it doesn't change the overall width of the package.** On a 7.5" wheel your tire sticks out 2.5" past the wheel edge. On a 8.5" wheel your tire sticks out 2" past the wheel edge. But either way, the position of the tire is determined by the wheel offset and the width of the tire isn't changing.

If the tread is currently even with the flares, you'll have the tread poking out by 1.69 inches on +1mm offset wheels.


**Technically changing rim width very slightly affects tire width because the tire stretches differently, but it's insignificant here.

 

[JINO]

17x8.5, I believe 0 offset. Perfect for me.

 

[USAFREODRetired]

So I ended up shooting that pic to Method tech support, and they recommended 17x9 -12mm.

Pretty damned close to spot on with what I had on stock rims with spacer, just a few mm further out.

Very happy with the results.

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