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Old 12-13-2011, 08:40 PM   #1
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Question on Max tire width that can go on stock 17" rims

This is crazy. I just ordered my JKU SportS, due some time in January and I am already thinking about changing my tires.

I am not very fond of the stock tires that's on the SportS. Due to budget constraints, I am thinking of only changing the tires to the Duratec but herein lies a slight problem.

The stock tires are 255 x 75 x 17 Which equates to 32.3" x 10" x 17"
Stock rims are 17 x 7.5

Unfortunately Duratecs do not make this size. the closest size I could find to match my wheels are:

Option 1
265 x 70 x17 which equates to 31.7" x 10.5" x 17 (Rim size range 7 - 8.5)

or if I go up one more size
Option 2
285 x 70 x 17 which equates to 32.8 x 11.5 x 17 (Rim size range 7.5 - 9)

The stock rim being 7.5 should be able to take both the tires.

Couple of questions

1. Change in height of the stock tire from 32.3 to either (31.7 or 32.8)
2. Change in width of the stock tire from 10" to either 10.5 or 11.5)

Is it going to work without any issues or would I need to change the BS or offsets for any of the two options.

Thanks in advance for all the replies. This place is awesome.

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Old 12-13-2011, 08:44 PM   #2
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Don't change anything yet. Pick up your jeep and then sell your stock wheels AND tires as soon as you drive them home. Mine went for $500 and I didn't even sell the wheels with them. You will probably be able to get another $100-150 for the wheels with them. Then you can buy a set of smaller wheels and bigger tires. This is how most people do it.

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Old 12-13-2011, 08:45 PM   #3
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Option 1 will fit perfectly, option 2 will require 1 of 2 mods. The first is wheel spacers which would run you $100-$200. The second tho which my friend uses on his jk is to put a washer or 2 on the steering stops. The tires will only rub at full lock if you dont do anything so if you adjust where full lock is, it won't rub anymore. It's about $.50 too so that would be the best option if you do #2
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Old 12-13-2011, 08:59 PM   #4
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If I decide to sell the whole stock tire/wheel package and go with a smaller wheel - let's say 16" or 15", do I have to do a lift or can I make the change with only changing the back spacers etc. I do not want to do a lift at this point.

The options I saw on tire rack were

Option 1
285 x 70 x 16 which equates to 33.1 x 11.3 x 16
Rim width range: 7.5-9

or Option 2
33 x 12.5 x 15 (Overall diameter is actually 32.5)
Rim width range: 8.5 - 11

With either of the two options, I will probably need to do change Back spacers. Is that all or would I need to do a lift.

Also - How can I calculate if my tire will stick outside of the fender. I do not want it to stick outside the fender.
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Old 12-13-2011, 09:04 PM   #5
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Quote:
Originally Posted by sunnykk View Post
If I decide to sell the whole stock tire/wheel package and go with a smaller wheel - let's say 16" or 15", do I have to do a lift or can I make the change with only changing the back spacers etc. I do not want to do a lift at this point.

The options I saw on tire rack were

Option 1
285 x 70 x 16 which equates to 33.1 x 11.3 x 16
Rim width range: 7.5-9

or Option 2
33 x 12.5 x 15 (Overall diameter is actually 32.5)
Rim width range: 8.5 - 11

With either of the two options, I will probably need to do change Back spacers. Is that all or would I need to do a lift.

Also - How can I calculate if my tire will stick outside of the fender. I do not want it to stick outside the fender.
If you want to get a 33" tire then you need a wheel with 4.5 or more backspacing to run larger tires without spacers. A great size for a 16" wheel is 305/70/16. You can get Duratracs in this size or many others too. If you go to a 15" wheel, then 33x12.5R15 on either black chaos, pro comp or MB72 wheels is a very good choice. Here is a link showing both tire sizes. The JK has the 15" MB wheels and the JKU has pro comp 16"

http://www.wranglerforum.com/f33/day...es-115657.html
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Old 12-13-2011, 09:21 PM   #6
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Thanks for the link #ESP.

Probably go for the 16" wheels. I read somewhere that some folks have had issues with 15" wheels with rubbing etc.

I never got any feedback regarding lift. Everyone that does tires also do lift. At this point, without doing any lift, can I still go wider and a bit taller?

The 305 x 70 x 16 looks amazing. It sticks outside of the fenders which could be an issue with clearing safety. I guess, that's the nature of the beast huh!

Question on backspacing and spacers.

Is backspacing dimension specified as part of the wheel specs and is spacers something you add later?
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Old 12-13-2011, 09:44 PM   #7
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Originally Posted by sunnykk View Post
Thanks for the link #ESP.

Probably go for the 16" wheels. I read somewhere that some folks have had issues with 15" wheels with rubbing etc.

I never got any feedback regarding lift. Everyone that does tires also do lift. At this point, without doing any lift, can I still go wider and a bit taller?

The 305 x 70 x 16 looks amazing. It sticks outside of the fenders which could be an issue with clearing safety. I guess, that's the nature of the beast huh!

Question on backspacing and spacers.

Is backspacing dimension specified as part of the wheel specs and is spacers something you add later?
Both wheels and tire combos shown in the link will rub badly with mild off roading and no lift. You need at least a leveling kit to avoid the rears hitting the fenders but you'd be better to get a 2-2.5 kit with them eventually. You can run both of the ones shown in the link without a lift and no spacers. You do not need spacers with those wheels and tires. 15 and 16 wheels are a great choice for a JK. Here is a list of which 15's fit over the brake calipers with no modification. Just buy them mount a tire on them and stick them on. The 16s will clear without modifications. I have MB72 15x8 wheels with 3.75 of backspacing and -19mm off set.

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Old 12-13-2011, 10:00 PM   #8
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It's getting very confusing. I read somewhere that if you change the tires and the center line of the new combo is not close to where the center line of the OEM wheel/tire combo, there could be stress on the bearings.

My limitations are, I don't want to do a lift and I don't want the tires to stick outside of my fenders. I am leaning towards the 16" rim size and the two tire options I have is:

Option 1
265 x 75 x 16 which equates to 31.7 x 10.5 x 16
Rim width range: 7-8

Option 2
285 x 75 x 16 which equates to 33.1 x 11.3 x 16
Rim width range: 7.5-9

How do I calculate the backspacing required on the wheels to match the position of the new combo to the stock combo.

Stock is 255 x 75 x 17 --32 x 10 x 17. I read somewhere that it is 6.25" but I cannot confirm. For calculation purposes, let's assume that the backspacing is 6.25".
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Old 12-13-2011, 10:17 PM   #9
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Does anyone know of rubbing with the Black Rock D Window Alloy 15's
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Old 12-13-2011, 10:27 PM   #10
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I would just buy a set of wheels and stick them aside until you can afford to buy tires. When you have them both, put them on. Plus, having a set of brand new wheels sitting around is great incentive to save for the tires......
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Old 12-13-2011, 11:12 PM   #11
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Anyone know exactly what the backspacing is for the stock SportS 17" Rims.
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Old 02-12-2013, 11:23 AM   #12
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back spacing

I believe the back spacing is 6" on a stock wheel. to handle 12.50 wid most recommend a 4.5" back space. I been looking in to this my self. I like to go 35x12.50 on a 17" rubicon wheel. will not work unless you use spacers which are illegal in my state of new jersey. good luck
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Anyone know exactly what the backspacing is for the stock SportS 17" Rims.

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