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Old 03-23-2016, 09:47 PM
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Backspacing??

Hello all,

I recently bought my BFG KO2 315x70x17 and I was looking at ProComp 5034 Rockwell wheels (which have a 4.75 back spacing and 0 off set) for my 2.5" Rubicon express lift. A buddy of mine said that the back spacing is too much for my lift and is going to stick out and look funny.

What do you think? Is it too much 4.75 too much back spacing for 35s and 2.5" lift?

Pics would help!
Thanks guys

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Old 03-23-2016, 09:49 PM   #2
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Not too much at all. I don't have a pic with 4.75" BS, but here's 4.25" with 37x12.50r17's.


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Old 03-23-2016, 10:26 PM   #3
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Several lifts require 4.5" backspacing...Here is the best I have, but these were 4.75" backspacing with 35x12.50R17 and I still rubbed the control arms (Anvil JK Front Left).
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Old 03-23-2016, 11:40 PM   #4
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Quote:
Originally Posted by Mattarboleda54 View Post
Hello all,

I recently bought my BFG KO2 315x70x17 and I was looking at ProComp 5034 Rockwell wheels (which have a 4.75 back spacing and 0 off set) for my 2.5" Rubicon express lift. A buddy of mine said that the back spacing is too much for my lift and is going to stick out and look funny.

What do you think? Is it too much 4.75 too much back spacing for 35s and 2.5" lift?

Pics would help!
Thanks guys
This is the same as running 1.5" spacers on stock rims. You will be fine and at most will rub slightly on your lower control arm at full wheel lock left or right which will not do anything to them except wear the powder coat off. You may need to set your bump stops a little longer if there is rubbing on the fender flares or you may not. Best to test this out while disconnect and make sure while doing so you turn your wheels full left and right. Most of the time 4.75" BS works well while the tires are straight. It is when you are turned and articulated that the tires often rub the flares.
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Old 03-24-2016, 12:23 AM   #5
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Most with 315's will run 4.5 to 5.0 Back Spacing!!!
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Old 03-24-2016, 12:43 AM   #6
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For sticking out an looking funny, that's up to you.

backspacing will push the rim out 1.5" out, then the tires themselves will stick out an additional 1.18" (1/2 of 255vs315). So in a perfect numerical universe, the tires will be sticking out 2.68" from stock. If my math is right. Be prepared for flinging crap,
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Old 03-24-2016, 09:05 AM   #7
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4.5" BS with 35s on mine, only straight on pics I have:
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Old 04-10-2016, 02:26 PM   #8
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back spacing

I have 4.5 inch back spacing...negative 12 off-set. 315x70x17 tires. 2.5 inch teraflex leveling kit.
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Old 04-10-2016, 02:32 PM   #9
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back spacing

Front view of 315x70x17, 2.5 inch teraflex lift. 4.5 inch backspacing.
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Old 04-10-2016, 05:22 PM   #10
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Originally Posted by Hivedr View Post
This is the same as running 1.5" spacers on stock rims.
It's about 1/2" difference. The aftermarket wheels have 0 offset. Stock wheels are +51mm or something. Subtract 38.1 for the 1.5" spacer and you have about +13 offset. So the tire will stick out about 1/2" farther on the aftermarket rim than it will on stockers with 1.5" spacers.
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Old 04-10-2016, 06:32 PM   #11
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3" lift with Teraflex LCA's, I just put them on and haven't wheeled them. Lock to lock with a few inches of clearance on each side.
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Old 04-10-2016, 07:06 PM   #12
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Originally Posted by milfblaster View Post
It's about 1/2" difference. The aftermarket wheels have 0 offset. Stock wheels are +51mm or something. Subtract 38.1 for the 1.5" spacer and you have about +13 offset. So the tire will stick out about 1/2" farther on the aftermarket rim than it will on stockers with 1.5" spacers.

NO kidding, really! An 8" wide aftermarket rim will stick out 1/2" further than a 7.5" wide factory rim when both have the same backspace either by design or with the addition of a space. Would that not have been easier to say than using measurement systems in this case metric and inch and doing a mathematical equation without converting to one or the other ( either all metric or all inch) prior and adding to what confession might already exist? Remember most Americans have no idea how to use or convert metric to inch or inch to metric.

Point I think you wanted to make but fell short was the tire/rim combination will stick out
even further than expected by the OP.

Simple answers go much further for newer folks.
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Old 04-10-2016, 07:22 PM   #13
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Quote:
Originally Posted by Mattarboleda54 View Post
Hello all, I recently bought my BFG KO2 315x70x17 and I was looking at ProComp 5034 Rockwell wheels (which have a 4.75 back spacing and 0 off set) for my 2.5" Rubicon express lift. A buddy of mine said that the back spacing is too much for my lift and is going to stick out and look funny. What do you think? Is it too much 4.75 too much back spacing for 35s and 2.5" lift? Pics would help! Thanks guys
a 4.76" backspace is going to be a 9.5" wide wheel. Sure it is not a 9" wheel with 4.75" backspace making it -6 offset?
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Old 04-10-2016, 07:24 PM   #14
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Originally Posted by Hivedr View Post
NO kidding, really! An 8" wide aftermarket rim will stick out 1/2" further than a 7.5" wide factory rim when both have the same backspace either by design or with the addition of a space. Would that not have been easier to say than using measurement systems in this case metric and inch and doing a mathematical equation without converting to one or the other ( either all metric or all inch) prior and adding to what confession might already exist? Remember most Americans have no idea how to use or convert metric to inch or inch to metric.

Point I think you wanted to make but fell short was the tire/rim combination will stick out
even further than expected by the OP.

Simple answers go much further for newer folks.
yer math is way off. milfbuster was on the money. You, not. Simple enough?
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Old 04-10-2016, 08:57 PM   #15
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I didn't mean to come off as a dick. 0 offset should be good for 35s with no rubbing. Stock with spacers is like +13 or AEV wheels are like +10. Some people run 35s on them with no problems, but others might rub the passenger rear. Kind of depends on the suspension, or type of wheeling, I guess. Jeep people don't usually like to talk offset. I like it because you can figure out where the center of the tread is going to sit down to the millimeter. If you also know the actual tire width, that tells you how it will sit in the wheelwell. Just because they don't teach you in high school that 25.4mm=1in doesn't mean you can't learn it on your own.
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Old 04-10-2016, 09:48 PM   #16
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yer math is way off. milfbuster was on the money. You, not. Simple enough?
Please point out the math equation I posted. Then explain how you gave the OP any answer to his question by posting on this thread. At least I explained possible problems with the backspacing he is looking at. You added nothing except another worthless post count to your name.
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Old 04-10-2016, 10:03 PM   #17
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I didn't mean to come off as a dick. 0 offset should be good for 35s with no rubbing. Stock with spacers is like +13 or AEV wheels are like +10. Some people run 35s on them with no problems, but others might rub the passenger rear. Kind of depends on the suspension, or type of wheeling, I guess. Jeep people don't usually like to talk offset. I like it because you can figure out where the center of the tread is going to sit down to the millimeter. If you also know the actual tire width, that tells you how it will sit in the wheelwell. Just because they don't teach you in high school that 25.4mm=1in doesn't mean you can't learn it on your own.
You did not come off as a dick and I might have come off a little hard in my chose of words. I was not disagreeing with you just wanted to point out that new folks when given to much information get confused easily. The longer you are here on this Forum and read the same questions over and over and over what I posted about simple answers will make sense.

To the OP sorry for the HiJack of the post I hope you are though getting the answers you need for you build.

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