Backspacing! Is my math right? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 04-26-2010, 04:18 PM Thread Starter
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Backspacing! Is my math right?

Ok! Running stock 17" rims with 1.5" spacers. Read that stock 17" rims have a huge 6.5" backspacing, so If I want to replace my stock rims and spacers with steel rims I'd want to run with rim with 5" backspacing, but would be better off with a rim with 4.25" to 4.5" backspacing in case I wanted to go with bigger tires in the future!

My math right of do I need to be skooled some more?

Mike B

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post #2 of 14 Old 04-26-2010, 04:21 PM
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IIRC, The BS on the stock wheels is only 6. 1.5" Spacers would be right and that is what i have used in the past with zero problems.
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post #3 of 14 Old 04-26-2010, 04:34 PM
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Big A's number make sense.

4.5" is the max backspacing you want to run wider tires. 4" will work even better if you don't mind them sticking out a little further and if you ever think you might run a tire wider than 12.5".


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post #4 of 14 Old 04-26-2010, 05:38 PM Thread Starter
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Big A's number make sense.

4.5" is the max backspacing you want to run wider tires. 4" will work even better if you don't mind them sticking out a little further and if you ever think you might run a tire wider than 12.5".
Thanks guys! so I'll be safe with 17" rims with a backspacing of 4 to 4.5"

Plan on changing out my stock alloys for steelies!

Mike B

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post #5 of 14 Old 04-27-2010, 12:30 PM
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Thanks guys! so I'll be safe with 17" rims with a backspacing of 4 to 4.5"

Plan on changing out my stock alloys for steelies!
Sounds right. I'm running 4.25" back spacing with a 285/75r16 and the tires only stick out about 1" past the stock flair.
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post #6 of 14 Old 04-27-2010, 01:04 PM
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I don't havem, but if you use steelies they have to have a BS of 3.75" or LESS (3.5/3.25), otherwise they won't clear your brake calipers

If you then use adapters, your wheels will stickout like sore thumbs

Thats if you have an 07 or later JK !!

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post #7 of 14 Old 04-27-2010, 01:31 PM
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JIMBO, I think you mean you need 3.75" of BS or less if you use a 15" wheel. I don't think it matters if it's a steel wheel or not (although, maybe only steel wheels are made in that diameter... I don't know).


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post #8 of 14 Old 04-27-2010, 01:39 PM
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Yea, I'm afreaid about the only choices you have for steel is 15"x8"


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Originally Posted by jeeperjkj View Post
JIMBO, I think you mean you need 3.75" of BS or less if you use a 15" wheel. I don't think it matters if it's a steel wheel or not (although, maybe only steel wheels are made in that diameter... I don't know).
Someone may make larger dia. steelies, but your really gonna have to pay and I doubt if you get many choices in width !!

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post #9 of 14 Old 04-27-2010, 05:48 PM
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There are some 17x9" steel wheels and I think there are some 17x8's, too. I was lookin' at them before I got my wheels.


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post #10 of 14 Old 04-27-2010, 05:59 PM
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There are 17x 9 pro-comp steelies sitting on my jeeep as I type. So yup they make them.
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post #11 of 14 Old 04-27-2010, 06:20 PM
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WOW, thankz for that, I didn't know anybody even used em

Thanx for the info

JIMBO


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post #12 of 14 Old 04-28-2010, 04:07 AM
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jp mag did a article on backspacing about 3 months ago, they said with 17's up to a 35 inch tire 4.7 was the ideal backspace for the jk, it was a pretty good article
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post #13 of 14 Old 04-28-2010, 05:58 AM
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Yea, 4.5" has been the BS, I've used for several sets of ProComps on my JK

I've used adapters/spacers, mainly because of the Bushwackers !!

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post #14 of 14 Old 05-02-2010, 09:42 PM
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back spacing.......

Depending on which lift you go with it will require a 4.5 back spacing. 4.0 will rub your lift. I have a poly 4.5" lift and it does require a 4.5 back spacing and that leaves only minimal clearance on each side.
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