Wheel backspace ?

[LIJLURguy]

Is anybody running 17 x 9 wheels with -12 offset… Pics please found a set but don’t know how much they will stick outside fenders ... 37 Nitto ridge grapplers are my plan ty

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[TroyBoy]

The center of your tread will move out 45mm - -12mm = 57mm. Aka 2 1/4”

Edit: center of tread will move out Stock offset - new offset. And that is regardless of wheel width and/or tire width

 

[TroyBoy]

I’ll take that one step step further. Your tires will stick out 2 1/4” farther assuming same tire size but with your new wheels. Now if your new tires are 1” wider then divide that by 2 and add it to 2 1/4”. You get 2 3/4” further out than stock.

 

[LIJLURguy]

I’ll take that one step step further. Your tires will stick out 2 1/4” farther assuming same tire size but with your new wheels. Now if your new tires are 1” wider then divide that by 2 and add it to 2 1/4”. You get 2 3/4” further out than stock.

Right now it is a stock Rubicon, tires are pretty much flush with the fenders, so I may looking at 2 1/2/3 inches of tire sticking out of the fender?

 

[TroyBoy]

Right now it is a stock Rubicon, tires are pretty much flush with the fenders, so I may looking at 2 1/2/3 inches of tire sticking out of the fender?

Yup. Backspace isn’t that useful for figuring out how far a tire will stick out because it is directly related to the wheel width. Offset comparison doesn’t have limitation because it is related to the center of the wheel. For example, a wheel that is 7.5” wide and a wheel that is 10” wide with the SAME offset won’t move your tire at all. (Your sidewall would buldge out more though but your top tread won’t have moved)

 

[obiwankabaldi]

Is 2 1/2 to 2/3/4 to wide? Anyone have any pics of that. I ordered the exact same set up and was hoping It was a good choice judging from looking at some I see on the street. Never got to see a Jeep with that look.

 

[TroyBoy]

Is 2 1/2 to 2/3/4 to wide? Anyone have any pics of that. I ordered the exact same set up and was hoping It was a good choice judging from looking at some I see on the street. Never got to see a Jeep with that look.

Do you mean is the stance too wide? That is subjective. It is more than needed. Also remember that it will be different on a non rubicon beacause of the longer axles. You may have to consider your local laws too.

 

[martyb511]

The center of your tread will move out 45mm - -12mm = 57mm. Aka 2 1/4”

Edit: center of tread will move out Stock offset - new offset. And that is regardless of wheel width and/or tire width

I'm assuming you're using 45mm because this is the offset for the Rubicon wheels? Would you happen to know that the standard sahara wheels offset is?

 

[MacBigButt]

Sahara and Rubicon offset is the same, just diameter is different. My new rims are 17"x9 with -12mm offset. Here is what the 34" ridge grapplers look like on mine. Check out this thread, lots of pictures from a few different people that have gone this route. There are a few other threads as well and a few with 37", they seem to look good as well.

https://www.jlwranglerforums.com/forum/threads/285-75r17-on-sahara.3609/

Also, a really good site to check out is https://www.rimsntires.com/specspro.jsp they have a great app that graphically shows the differences.

 

[BobK]

I know this an old thread, but I have the same question. Today I have a stock JLU Rubicon (stock wheels and tires). I have purchased a set of 37 in BFG KO2's (37 x 12.5 x 17) and a set of Rockstar wheels that have an offset of -12 and backspace of 4.53.

I am generally not a dense person, but I am still confused buy the backspace/offset issue. My question is dead nuts simple, will my tires stick out beyond the fenders?

 

[martyb511]

I know this an old thread, but I have the same question. Today I have a stock JLU Rubicon (stock wheels and tires). I have purchased a set of 37 in BFG KO2's (37 x 12.5 x 17) and a set of Rockstar wheels that have an offset of -12 and backspace of 4.53.

I am generally not a dense person, but I am still confused buy the backspace/offset issue. My question is dead nuts simple, will my tires stick out beyond the fenders?

My estimate is your new tire/wheel setup will stick out over 2.8” from the stock tire location.

 

[PavementWarrior]

Is anybody running 17 x 9 wheels with -12 offset… Pics please found a set but don’t know how much they will stick outside fenders ... 37 Nitto ridge grapplers are my plan ty

Anything with a negative offset on the JL is gonna be sticking out it looks like

 

[River City Offroad]

-12 offset on a 9” wheel is the same thing as 4.5” back spacing if you want to open up your search terms.

4.5” will put the tires slightly outside the flares for a nice aggressive. The vast majority of aftermarket wheels in the JK/JL bolt pattern of 5 on 5 are 4.5” and 4.75”.

Marcus

 

[Chocolate Thunder]

For those that are offset/backspace challenged this tool does all the work and presents the answer in a visual format that is easier for most people to understand. Just plug in the numbers on the current tires/wheels and the new ones.

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

 

[cabnfvr]

Is anybody running 17 x 9 wheels with -12 offset… Pics please found a set but don’t know how much they will stick outside fenders ... 37 Nitto ridge grapplers are my plan ty

Kevin has a video of 38s with -12 backspacing on 17 x 9s. Go to the 7:30 mark for a walk around view. (Kevin, hope you don't mind.)

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