What offset wheel to match this stance?

[PegFundy]

Hi and welcome to another offset thread. I've been math-ing this for days & can't nail it, please help.
This is our 18 Sport S w/ 315 KO2s 2.5 RC lift & Black Rhino Convoy wheels, 17x8.5 4.04 BS and -18mm offset. This fender measures 12" from the body at its widest front point.

If I wanted the same ballpark poke for my '24 Willys with the same tires & lift but a 13" wide fender (is it wider to account for the wider axle or just a model year difference?) would I just stick with a similar set-up? Looking at:

Black Rhino Primm 17x9 5 BS w/ 0 offset or 4.29 BS with -18mm offset
Method 315 17x8.5 4.75 BS 0 offset or 17x9 4.5BS -12 offset
Fuel Covert 17x9 4.53 BS -12 offset

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[yokramer]

The Willys I believe is gonna have the wider Rubi axles now won’t it. If so this is 9” wheel with -12mm offset 315 tires on a 23 Rubicon

 

[PegFundy]

The Willys I believe is gonna have the wider Rubi axles now won’t it. If so this is 9” wheel with -12mm offset 315 tires on a 23 Rubicon

Perfect. It looks like -12mm is the way to go then. Thank you so much!

 

[Flip]

Once I finally got back spacing down it seems like everything switched to offset. It takes my old brain a while to figure it out, the offset calculator helps me a lot but the guy to really narrow it down precisely regarding offsets is @azwjowner

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

Best of luck my friend.

 

[yokramer]

Perfect. It looks like -12mm is the way to go then. Thank you so much!

Id make sure that they are the same axles ... actually @John VonJeep can probably confirm that they are both the wide axles.

 

[azwjowner]

Once I finally got back spacing down it seems like everything switched to offset. It takes my old brain a while to figure it out, the offset calculator helps me a lot but the guy to really narrow it down precisely regarding offsets is @azwjowner

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

Best of luck my friend.

To maintain the same distance poking out from the fender when the fender gets 1 inch wider, you need an inch less offset, except that the 2024 Willys has wider axles (3/4" wider on each side) than your Sport, so you only actually need to move the wheel out only 1/4 inch (or 6mm).

Thus, if you had -18mm offset before, you are looking for about -24mm offset. In real life you probably won't notice 1/4" so I would just buy the same -18mm wheels; the fender width more or less matches the wider axle (that's why Jeep makes the fender wider).

 

[yokramer]

To maintain the same distance poking out from the fender when the fender gets 1 inch wider, you need an inch less offset, except that the 2024 Willys has wider axles (3/4" wider on each side) than your Sport, so you only actually need to move the wheel out only 1/4 inch (or 6mm).

Thus, if you had -18mm offset before, you are looking for about -24mm offset. In real life you probably won't notice 1/4" so I would just buy the same -18mm wheels; the fender width more or less matches the wider axle (that's why Jeep makes the fender wider).

Other way, with the wider axel* you need more positive offset so closer to 0 not further.

 

[2nd 392]

If wide axles and Rubi flares 12.50’s tread is even with stock 7.5” 44mm

with 8.5” -1 mm even with XR extensions

-12 mm is ~ 1/2” more poke

 

[azwjowner]

Other way, with the wider axel* you need more positive offset so closer to 0 not further.

Yes, but my math is correct. That's why the new offset is only 6mm less than the old. The fender was an inch wider but the wider axle requires adding 3/4 inch to the offset.

 

[ellunchboxo]

My 24 Wilys with -12 offset Methods and 35x12.5 tire

 

[yokramer]

Thus, if you had -18mm offset before, you are looking for about -24mm offset. In real life you probably won't notice 1/4" so I would just buy the same -18mm wheels; the fender width more or less matches the wider axle (that's why Jeep makes the fender wider).

Yes, but my math is correct. That's why the new offset is only 6mm less than the old. The fender was an inch wider but the wider axle requires adding 3/4 inch to the offset.

-24mm would push the wheel even further out which would give them way more poke than what they have now. Stock is +44 so the more negative you get the further out it will stick, hence needing to go closer to 0 from -18 due to the wider axles already pushing the wheel out further.

 

[Flip]

If wide axles and Rubi flares 12.50’s tread is even with stock 7.5” 44mm

with 8.5” -1 mm even with XR extensions

-12 mm is ~ 1/2” more poke

I like the 7.5" wheels myself, looks good.

 

[2nd 392]

I like the 7.5" wheels myself, looks good.

Gee thanks, so the new $2,500 wheels look worse than the stock ones ?!

I appreciate the support— jerk

 

[Flip]

Gee thanks, so the new $2,500 wheels look worse than the stock ones ?!

I appreciate the support— jerk

Right, what I meant was; the new $2500 wheels look friggin awesome!!! Awesomeness bro, excellent choice. I've never seen a better looking wheel!

 

[azwjowner]

-24mm would push the wheel even further out which would give them way more poke than what they have now. Stock is +44 so the more negative you get the further out it will stick, hence needing to go closer to 0 from -18 due to the wider axles already pushing the wheel out further.

You're forgetting that the fender is 1 inch wider, which is more than the added axle width (3/4"). OP wants the same relative position of edge of the wheel to the fender. Let me break it down:

1. Current offset is -18mm.
2. The new Jeep has fenders that are one inch (call it 24mm) wider than the old. Thus, if the axles were identical, to maintain the same tire poke, the new wheel offset would have to move out 24mm, which would be -42mm.
3. The new Jeep has axles that are 3/4" wider on each side, so the starting position for the wheel is 18mm further out than the old Jeep. This has to be accounted for by moving the wheel back in by 18mm.
4. -42mm + 18mm = -24mm

Or as I said, if you are moving the wheel mounting surface out by 3/4" (axles), and the fender out by 1", you have to move the wheel out by 1/4" (6mm) to match the existing poke. The current wheel offset is -18mm. -18mm - 6mm = -24mm.

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