Thoughts on American Truck (Mammoth) Wheel Spacers.

[adouglasjr]

I've been contemplating the installation of Mammoth Wheel Spacers, specifically the 1.5-inch variant, on my 2020 4WD Big Horn (non-haul/tow vehicle). In the process of planning this upgrade, I was informed by Discount Tire that these spacers are lug centric rather than hub centric prior to installation.

Before proceeding, I deeply value the insights and experiences of this esteemed community. Have any of you used lug centric wheel spacers on similar vehicles? Specifically, how critical is the difference between lug centric and hub centric in this context? Are there potential implications or considerations I should be aware of prior to installation?

Thanks,

Here is the spacer for reference: Mammoth RAM 1500 1.50-Inch Billet 6-Lug Wheel Spacers S113040 (19-23 RAM 1500) - Free Shipping

 

[CHeYeNNe71]

Many run KSP hubcentric on Amazon with no issues. I personally would never run lug centric.

 

[Geddyflea]

Many run KSP hubcentric on Amazon with no issues. I personally would never run lug centric.

Yep, KSP's are what I'm using and have had no problems in the 2 years or so that they have been on my truck.

Hub centric fit the trucks hub snugly so you don't have to worry about the spacers being installed or becoming un-centered. Another benifit, most of the weight of the truck is being supported by the hub. Lug centric is centered when you tighten the lug nuts holding the spacer to the hub. The weight of the truck is being supported by the wheel studs.

 

[adouglasjr]

Many run KSP hubcentric on Amazon with no issues. I personally would never run lug centric.

Thank you for sharing your perspective! Your preference against lug centric raises an important consideration. I'm looking to gather as much insight as possible before making a decision. I appreciate it.

 

[adouglasjr]

Yep, KSP's are what I'm using and have had no problems in the 2 years or so that they have been on my truck.

Hub centric fit the trucks hub snugly so you don't have to worry about the spacers being installed or becoming un-centered. Another benifit, most of the weight of the truck is being supported by the hub. Lug centric is centered when you tighten the lug nuts holding the spacer to the hub. The weight of the truck is being supported by the wheel studs.

It's reassuring to hear about your positive experience with the KSP spacers over the past couple of years. Your explanation about the differences between hub centric and lug centric spacers is very informative. Is this what you are referring too? https://www.amazon.com/KSP-Spacers-Forged-77-8mm-M14x1-5/dp/B083FD9Q3G?ref_=ast_sto_dp&th=1

 

[Geddyflea]

It's reassuring to hear about your positive experience with the KSP spacers over the past couple of years. Your explanation about the differences between hub centric and lug centric spacers is very informative. Is this what you are referring too? https://www.amazon.com/KSP-Spacers-Forged-77-8mm-M14x1-5/dp/B083FD9Q3G?ref_=ast_sto_dp&th=1

Yes, those are the ones that I'm using and I really like them. If cost isn't a consideration Bora spacers are the gold standard of wheel spacers. They are made in the USA, when you order them and come in about any thickness you can imagine. They also have a lifetime warranty.

 

[jabara572]

Yep, KSP's are what I'm using and have had no problems in the 2 years or so that they have been on my truck.

Hub centric fit the trucks hub snugly so you don't have to worry about the spacers being installed or becoming un-centered. Another benifit, most of the weight of the truck is being supported by the hub. Lug centric is centered when you tighten the lug nuts holding the spacer to the hub. The weight of the truck is being supported by the wheel studs.

Sorry this is 100% incorrect. Hub centric spacers/wheels do not support any vehicle weight whatsoever. Zero. Wheels are held to the hub via the massive friction force between the wheel and hub, provided by the clamping force from the lugs. There is zero movement of the wheel vs the hub; accordingly, properly tightened wheel studs see zero shear loads. That's is why when lug nuts get loose, the wheel can move, then the studs DO see shear load, and will shear almost immediately.

The only way the hub/hub centric portion would support any weight is if they were so closely machined it was a perfect or interference fit (then you couldnt get your wheels on and off). For this reason, all hubcentric rims have a gap, a tiny but significant gap. 2mm, 1mm, or 0.00001mm is the exact same, they do not carry any weight of the vehicle whatsoever.

Hub centric exists for one reason, to "help" better align the wheel during installation, potentially offering a smoother ride. But no, they do not have any weight carrying benefits at all.