Experienced effects of negative offset

[JL8jeff]

I'm not sure I would want to run a 3/8" wheel spacer, it's like a big washer and I'd worry about the lug nuts coming loose.

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[blue22]

thankfully it’s part of a designed kit that includes extended thread lugs. Really wanted 1/4 inch hub centric but couldn’t find any one who made them

 

[swamp2]

i Just don’t understand the desire to have some poke, unless trying to fit larger tires.

For many I'm sure it's just looks. For me it was some protection of Big Bertha's (Raptor) somewhat delicate hips. I do also prefer the more aggressive look.

Good thing the wheels I really liked were available in 0 offset rather than something that made way more poke...

 

[solracarevir]

I'm Running -10 on my Sasquatch Bronco for almost 2 Years now with no issues. I've also been offroad multiple times.

 

[87-Z28]

referencing offset with out tire size has NO quantifiable value with respect to loading and response of steering. Zero value. Both tire size and offset are required to assess the effects on steering and loads.

I am running black wheels for over three years now and have not had any issues whatsoever.

 

[blue22]

Hence your reference to 50” tires. Which obviously is not happening. So my situation is improved with a larger tire. 33 is my limit

 

[87-Z28]

Hence your reference to 50” tires. Which obviously is not happening. So my situation is improved with a larger tire. 33 is my limit

Indeed.

I would run the 33s with your rims. It will look much better, still provide aggressive poke, and reduce your scrub radius some, and work well with your gearing. (3.73 I assume).

I am kinda cheap so I would probably wear out the base 30s some before getting new tires.

keep an eye on the wheel spacers. Check them every so often for proper torque.

 

[blue22]

Yeah ultimately that’s my direction for both on and off road setups. But I wanted to wear out the stockers first.

 

[blue22]

And no I have mt so it’s 4 something I can never remember. Not that it’s relevant to my wheel situation. I’m cheap to, that’s what got me into this predicament

 

[blue22]

Has anyone heard of machining back side of wheel to relieve the clearance issue that I need a spacer for? I don’t know exact amount. I do know I borrowed some plain 1/4” inch spacers to test and it was enough. I can quantify it I suppose with some washers.

 

[JL8jeff]

You might be able to grind down that raised section on the brake caliper assuming that is where you are hitting. Do you have some pictures of the wheels showing the back side and where it's hitting?

 

[projectbadlands]

I have been running -12mm 8.5x17 with no issues whatsoever since 2021. No difference in how the vehicle handles on road or off road.

 

[blue22]

Thanks projectbadlands! What diameter tires?

 

[blue22]

No pictures JL8jeff. I’m kind of grasping at the wheel machining. If I were to do anything to the brakes, it would be on some swap outs. I’ve yet to identify the exact rub spot.

 

[AZ4x4Adventure]

Wheel offset will determine the moment arm (leverage) applied to the steering (kingpin) axis. Increasing this leverage will most definitely increase loads along load path from tire contact patch to frame. This includes wheel bearings and ball joints. The primary load carrying members (knuckle, UCA, LCA) can handle increased loads. The main concern would be additional long term wear and tear on the wheel bearings and ball joints. Nothing will explode.

a perhaps more significant concern would be the increased loads acting on the steering rack through the tierods when this leverage is increased. You will not likely be able to notice any increased steering resistance on pavement. Where this may become a more significant issue is when pushing the steering rack to its limits in more challenging terrain, deep snow, sand, mud or other terrain that may challenge the rack.

Both scrub radius and mechanical trail are needed to fully define this (3D) moment arm. In a simplified 2D sense, scrub radius is usually the primary metric used to evaluate steering resistance. The oem designed scrub radius is very small, <1 inch. You can calculate your current scrub radius from the attached formula. Don’t be alarmed if your scrub radius is rather large. Nothing will explode. It is just good practice to try and minimize scrub radius.

Just bolt on 50” tires.

If we were to increase the LCA length and remake the knuckle to keep the top ball joint location, would that new angle make adding more negative offset wheels possible without changing the OEM scrub radius?

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