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Discussion Starter · #1 ·
what is a better number for not having to use wheel sapcers, 4.9, or 4.52, i am confused as to what number you should be looking for, do you want a lower number, or higher number? And if 4.5 which i hear is the amount you want, is 4.52, an issue, or is it fine. Thanks in advance, about to pull the trigger on wheels and 35's. Just need this answered, cuz i have a couple options. Thanks again. :beer:
 

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two hundreths of an inch ain't gonna make a difference on the 4.52" compared to the 4.5"
 

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backspacing is measured from the BACK of the rim to the mounting surface of the wheel. IE: a 3" backspacing sticks out an inch more than a 4" backspacing wheel.

I am running 3.5 on my 37's and Bev is running 4" on 35's
 

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Discussion Starter · #4 ·
thank you, so i am good with 4.52 then, done. about to press purchase right now, lol.
 

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i have question not to take over your thread or anything but what size spacers do i need to get for a 3 inch lift and do i need it on all 4 tires or just the front sorry im really new to all this
 

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i have question not to take over your thread or anything but what size spacers do i need to get for a 3 inch lift and do i need it on all 4 tires or just the front sorry im really new to all this
well it depends on what backspacing your wheels are ... if you have atleast 4.5 backspacing you should be ok without a spacer... and yes if you need them you would need 4 of them..
 

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Discussion Starter · #9 ·
well it depends on what backspacing your wheels are ... if you have atleast 4.5 backspacing you should be ok without a spacer... and yes if you need them you would need 4 of them..
I know i would need four of them, i have just heard that you need at least 4.5 in of backspacing, and the wheels i found that i like for a price i like at the exchange are 4.52 in of backspacing, i was inquiring if that is sufficient enough to not run spacers. So my question is, is 4.52 in of backspacing good enough to bnot run spacers on 17x9 with 4.52 in of backspacing and running 35/12.50's. Thank you for any responses, i am waiting for the right response to pull the trigger.
 

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I'm running 37's on 4.5BS. No touching with axle centered. But I find out quickly it was not centered.
 

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4.52" Backspacing with 35X12.5" tires should be enough unless you have some tires with a high section width or your suspension configuration causes large axle side shifts.
 

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My first rims had 4.75" backspacing and were fine with factory lower control arms, as soon as I put in aftermarket control arms the tires rubbed on the front lower control arms. That was with 36x13.50 tires, when I went to a 37x12.50 they rubbed more and also on the frame, so I added 1.5" spacers. I now run 4" backspacing with no issues. 4.5" is most probably fine, but as others have said a maximum of 4.25" is better.
 

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Discussion Starter · #13 ·
im only running a teraflex leveling kit with chopped fenders
 

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You'll be fine then with 4.52" Backspacing
 

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i have question not to take over your thread or anything but what size spacers do i need to get for a 3 inch lift and do i need it on all 4 tires or just the front sorry im really new to all this
I don't think you would need spacers if you're only doing a lift; that is to say, unless you're getting new tires with that lift and need to push a wider than stock tire out a little more to avoid rubbing on suspension components.

There are different kinds of spacers.

Coil spacers, add a little extra boost in height by increasing the vertical height of your suspension spring - A/K/A the budget boost.

Wheel adapters are metal spacers that bolt onto your existing lugs and provide a new set of lugs that you bolt your wheel onto. They should ALWAYS be installed using loctite on the factory lugs so that the spacer is then permanently installed.

Wheel Spacers are just that, a metal spacer placed over your existing lugs that retain your stock lugs. They're not ideal since you're actually reducing the amount of lug you can bolt on to. They're not safe and really shouldn't be used. Ever.

Although most of us know that when we're discussing "wheel spacers", we're really talking about adapters, some folks might not so I thought I would just toss this completely unsolicited advice on the pile. :beer:
 

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Why must manufactures do shit like that to create confusion. Is that extra little 0.02" of backspacing THAT important to them? Why not just call it 4.5" and be done with it.

To whoever said 3.5" backspacing was perfect, what width of tire and wheel are you running? I think that's a little on the low side to call perfect. I'm on 9.5" wide wheels with 12.50" wide tires and my tires stick way out. With 3.5" backspacing, I'd be 1/2" further out. I can see where you'd want that, maybe, if you're running a 13.50" or 14.50" or wider tire, but with the "normal" 12.5" wide tire, I think 4"-4.5" is about right.
 

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Discussion Starter · #17 ·
thanks for the help, i am ordering today then.
 

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Why must manufactures do shit like that to create confusion. Is that extra little 0.02" of backspacing THAT important to them? Why not just call it 4.5" and be done with it.
Maybe because there are folks out there that would complain to the manufacturer that they don't know how to measure Backspacing if they'd say they are "Just" 4.5" ;).
I prefer offset over backspacing for tire position and in this case the offset is likely around -11 or 12 based on 9" wide rims. 0 Offset would likely still work with 35X12.5" tires which would mean about 4.75 Backspacing on a 9" wide rim
 

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OK, I could take the time to reseach this a little more, do some math and answer my own question, but I'm feeling a little lazy right now.

I have stock wheels with worn km2 35's and 1.25 spacers now. I am soon to be getting new tires and wheels and want a just a little wider stance than I have now. Would a 9" wheel with -10 offset be about right?
 

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Well stock Moab 17X7.5 got +44.45 mm Offset (I believe) minus 31.75mm (1.25") for your spacers leaves you with +12.7mm offset.
So with -10 offset on the new wheels the center of each tire would be pushed out by 22.7 mm ( a little over 7/8" ) from your setup with stock&spacers.
 
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