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Old 03-27-2019, 04:35 PM
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Synergy Wheel Adapters & Bolts

Hello Jeep Fans.

New to the forum - Long time reader, first time posting.

I am installing '15 Sahara rims on my '94 YJ and will need to use adapters. I've got the info needed for that and limited my choices to Spidertrax (1.25"); Synergy (1.5"); Rough Country (1.5"); Wheel Adapter USA (1.5"). Pretty much in that order.

My question really comes down to bolt strength and steel type. This seems to be the area that I find the most unspecified. I have read that a Grade 8; 10.x is what you should look for in the bolts. I also watched a video by a person that went through a few Rough Country's where the bolts got stripped and worn. Now I realize that this may be user error in his torque but it still had me wondering since I was initially leaning to that brand at first, but now I am looking at Synergy at $20/pr more.

Does anyone have any feedback on this as well as any of the other brand suggestions?

I am on a budget and still have some higher ticket items to replace such as rear main seal and exh. manifold. However I don't want my wheels falling off at 60 Mph. (Actually saw that happen this morning on a van on the way to work, but that's another story. Is that a bird? Oh crap its a tire.)

Thanks for your help and input.

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Old 03-27-2019, 04:40 PM   #2
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I would not run wheel spacers/adapters period.

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Old 03-27-2019, 10:25 PM   #3
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Old 03-28-2019, 05:48 AM   #4
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Save your money and buy rims with the proper backspacing and lug pattern. Some have had good luck with adapters/spacers. Some have had issues like broken studs and wheels flying off. I've also heard of tire balance issues with those things unless you do "on vehicle wheel balancing". Also, re-torque the lugs as part of the normal maintenance.




I myself would not jeopardize my life or any other motorist/pedestrian from running something like that.
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Old 03-28-2019, 07:07 AM   #5
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Physics will change your perspective...Here is a good read.

"Are wheel spacers safe?

Yes. When properly installed they are just as safe as wheels installed without spacers.

Will wheel spacers cause my wheel studs to bend?

No. The load from a wheel is transferred to the axle/hub through the friction of the clamped joint, not through the wheel stud. A wheel stud can only bend if the lug nuts are not properly torqued, in which case the wheel is about to fall off, anyway.

The Physics of Keeping the Wheels On

As long as the wheel, hub, and spacer are stiff enough to prevent flexing and loss of clamp force, the cause of most wheel stud failures is under tightened lug nuts (not enough clamping force) or over tightened lug nuts (the stud has been stretched past it's elastic limit, so the clamping force goes away). Therefore, properly installed wheel spacers are perfectly safe.
The wheel stud applies a clamping force that holds the wheel to the hub. When the lug nuts are tightened, the wheel studs stretch elastically, like very stiff springs. The lug nuts should be tightened until the stud is at 90% of its elastic limit. This will provide the greatest possible force to hold the wheel to the hub.
The amount of clamping force at a joint is important because of the coefficient of friction (Cf). The more clamping force applied to the joint (in this case the joint between the wheel and the hub), the more force required to make the wheel slip relative to the hub. Unless the wheel slips on the hub, there cannot be any bending load on the stud.
Coefficient of friction -- There is friction between the wheel face and hub face. This friction can be measured, and it is called the "coefficient of friction". The coefficient of friction (Cf) is the ratio of normal force, at the intersection of two surfaces, to the lateral force required to slip the bodies relative to one another. As an example, good street tires have a Cf of 0.9. This means that if there is a 100-pound vertical force applied to the tire, the tire can generate 90 lbs. of cornering force before it slides.
When the car starts moving, the stress applied to the stud does not change appreciably, unless one of two things happens:
The vertical component of any external force applied to the wheel is so great that the clamping force is not sufficient to hold the wheel in place, and it slips on the hub. At this point the stud is loaded in bending and in shear, and may yield, or even break.
Some portion of the clamped joint, wheel, or hub is not stiff enough to prevent flexing, and allows the tension load on the stud to drop to zero. With no tension load on the stud, the clamped joint is no longer tight. The wheel can then move relative to the hub, and place a bending load on the studs.
Inserting a wheel spacer between the hub and wheel changes nothing about these physics.
The hub center of a hubcentric spacer does not hold the spacer on the hub or reduce the chance of stud failure. There is never any load on the lip of the wheel spacer. For there to be a load on the lip, the friction force in the joint must have been completely overcome. The lip on a hubcentric wheel spacer serves only as an aid for wheel installation.
Increasing the length of the wheel studs to use a wider wheel spacer has no appreciable effect."
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Old 03-28-2019, 09:53 AM   #6
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Not just wheels running off or not, you're extending the length of the axle, on both sides, thus increasing the amount of leverage and stress on your front hubs/bearings, etc. accelerating wear or possible breakage. Why would anyone want to do that.??
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Old 03-28-2019, 02:39 PM
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Thanks for the comments. Something to be considered with them all.
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Old 03-28-2019, 08:48 PM   #8
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Welcome to the Forum LKohs,

IMO, the best solution is wheels with the proper backspace (usually 3 3/4" or 4" depending on tire width).
Wheel spacers, while OK when properly installed, would be my way second choice.

Good Luck, L.M.
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Old 03-29-2019, 07:25 AM   #9
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Quote:
Originally Posted by Krangler87 View Post
Not just wheels running off or not, you're extending the length of the axle, on both sides, thus increasing the amount of leverage and stress on your front hubs/bearings, etc. accelerating wear or possible breakage. Why would anyone want to do that.??
You doing that exact same thing when you run wheels with different back spacing. What is the difference between 1.5" back spacing change to bring the wheel out or a 1.5" spacer?

None.
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Old 03-29-2019, 08:32 AM   #10
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You doing that exact same thing when you run wheels with different back spacing. What is the difference between 1.5" back spacing change to bring the wheel out or a 1.5" spacer?

None.
Point taken, thanks for the correction.
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Old 03-30-2019, 12:54 AM   #11
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If I ever lift my jeep, I will be running spacers because I want to see how the stock wheels look.
I have read up on them and am not worried about it at all. There are HP monsters running spacers professionally so I doubt 190 horse is going to hurt much.
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Old 03-30-2019, 03:12 PM   #12
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I run 1.25" hub centric spacers on my 04 tj because I want the stock rims....
I would not use adapters to run jk wheels
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Old 03-30-2019, 07:36 PM   #13
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I run 1.25" hub centric spacers on my 04 tj because I want the stock rims....
I would not use adapters to run jk wheels



Neither would i, they are ugly!


Rusty white wagon wheels look better than JK wheels
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