285's Rubbing off road?

[Jms81661]

Ok we've covered the 285's ad nauseam.
Yes they'll fit. Crash bars, lift, spacers, etc.
BUT what I haven't heard is if you run the 285/70's with just a 1/4" spacer will they rub airing down while off roading?
Am I just better off going with a 1/2" or even a 1" spacer if I drop them into the teens while wheelin'?

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[DanaBovender]

I run 285/65/18's no issues at full compression or full articulation. I'm running +30mm offset wheels, BDS crash bars and a 3" leveling kit.
I can air down to 20psi and have had no issues

 

[Jms81661]

I run 285/65/18's no issues and full compression or full articulation. I'm running +30mm offset wheels, BDS crash bars and a 3" leveling kit.
I can air down to 20psi and have had no issues

You're not going as tall and have bigger rims. Wonder if it would matter much,?

 

[Jms81661]

Ok we've covered the 285's ad nauseam.
Yes they'll fit. Crash bars, lift, spacers, etc.
BUT what I haven't heard is if you run the 285/70's with just a 1/4" spacer will they rub airing down while off roading?
Am I just better off going with a 1/2" or even a 1" spacer if I drop them into the teens while wheelin'?

Wow Bora!
Asked if I could get the 1/4" and the 1/2" spacers in case I think the 1/4" are visually too small after thinking about them being aired down. Thought I'd buy a set of both and return the ones I didn't go with.
Nope!! No returns on these sizes. WTH?
Guess I'll go with 1/2" to be sure. Certainly don't want a set of $200 spacers sitting in my tool box for no reason.

 

[DanaBovender]

Use the tiresize.com wheel offset calculator

You're not going as tall and have bigger rims. Wonder if it would matter much,?

Both are a 32.6” tire 11.2” wide
What matters is the offset of your wheel

 

[NvrFinished]

I just posted the following down below on another thread that was asking the same question. Maybe it was you? I didn't pay attention

"Something to consider when airing down is that sidewall width actually decreases slightly due to the lower air pressure. In addition, most of the movement of the sidewall, whether it pushes in or out, happens where the tread is contacting the surface since that is the area of the tire where force is being applied.

I don't have experience with this off road, so maybe someone who does can chime in. However, I do have this experience on track. I have a car that frequents road courses. When the track tires and wheels go on, I have approximately 1/8" - 3/16" of clearance between the top inside of the front tires and the strut. Forces in a corner cause the bottom of the tire to deflect sideways a good 1/2" or more in each direction. However, there there is no rubbing of the tire on the strut since the force to the tire sidewall is being applied at the contact patch and not above it."

 

[Jms81661]

Use the tiresize.com wheel offset calculator



Both are a 32.6” tire 11.2” wide
What matters is the offset of your wheel

I'm sticking with the stock 17" rims cuz I can't find anything else I like. They are +55mm. I think I'll end up with a 1/2" spacer just to be sure. It's so damn complicated. I've been ready to buy new tires since I got it. Just can't get solid info on off roading and rubbing.

 

[DanaBovender]

With a 1/2” spacer you may need longer wheel studs, I can’t say for sure

 

[NvrFinished]

With a 1/2” spacer you may need longer wheel studs, I can’t say for sure

Most definitely. Some have even questioned if there are actually enough threads available to accommodate 1/4" spacers safely.

 

[Jms81661]

Most definitely. Some have even questioned if there are actually enough threads available to accommodate 1/4" spacers safely.

What, really? Oh ffs! Forget it I'm done I'm never getting new tires.? the fact I can't return the spacers is a deal breaker.

 

[NvrFinished]

What, really? Oh ffs! Forget it I'm done I'm never getting new tires.?

Yeah, if you're not that familiar with how wheel studs, spacers, and offsets all work together, it can get frustrating. I'm in the same boat of wanting to retain the factory wheels for now and just go to a 285/70R17 tire.

There are members here who have gone with that size in a BFG K02 and say they do not rub. There are other brands that do. No two manufacturers are identical in size. There are also some members who are using 1/4" spacers. However, no one has determined if that is actually wise or not.

We have 1/2" wheel studs. The studs have 20 threads per inch. If you use a 1/4" spacer then you are effectively loosing 5 threads (full turns of the lug nut) to maintain the required clamping force of approximately 90-100 ft-lbs. Is that OK? I don't know for sure.

At the minimum, thread engagement length must be equal to or greater than the diameter of the fastener. In other words, if the stud is 1/2-inch in diameter, the nut must engage onto the stud by at least 1/2-inch. And that's not considering the additional load placed from off roading.

I'm not sure if our lug nuts have 1 full inch of threads or not. Nor, am I sure of how much thread on the stud protrudes past the lug (if any) since the lugs are capped. But if we assume that they currently engage with a full inch, then you would be loosing 25% of the threads. If they engage at less than 1", then you would be loosing more than 25% of the threads for clamping force.

That is why I'm not a fan of spacers on stock length wheel studs.

 

[Jms81661]

Yeah, if you're not that familiar with how wheel studs, spacers, and offsets all work together, it can get frustrating. I'm in the same boat of wanting to retain the factory wheels for now and just go to a 285/70R17 tire.

There are members here who have gone with that size in a BFG K02 and say they do not rub. There are other brands that do. No two manufacturers are identical in size. There are also some members who are using 1/4" spacers. However, no one has determined if that is actually wise or not.

We have 1/2" wheel studs. The studs have 20 threads per inch. If you use a 1/4" spacer then you are effectively loosing 5 threads (full turns of the lug nut) to maintain the required clamping force of approximately 90-100 ft-lbs. Is that OK? I don't know for sure.

At the minimum, thread engagement length must be equal to or greater than the diameter of the fastener. In other words, if the stud is 1/2-inch in diameter, the nut must engage onto the stud by at least 1/2-inch. And that's not considering the additional load placed from off roading.

I'm not sure if our lug nuts have 1 full inch of threads or not. Nor, am I sure of how much thread on the stud protrudes past the lug (if any) since the lugs are capped. But if we assume that they currently engage with a full inch, then you would be loosing 25% of the threads. If they engage at less than 1", then you would be loosing more than 25% of the threads for clamping force.

That is why I'm not a fan of spacers on stock length wheel studs.

I'm not a fan of any
spacers either. But it seems to be an open ended discussion with no end in sight.
I do want to go with the KO2's. I'm just concerned with off roading. I'm out there every weekend. Sure don't want to snap off any studs. It's so frustrating.

 

[Jms81661]

Yeah, if you're not that familiar with how wheel studs, spacers, and offsets all work together, it can get frustrating. I'm in the same boat of wanting to retain the factory wheels for now and just go to a 285/70R17 tire.

There are members here who have gone with that size in a BFG K02 and say they do not rub. There are other brands that do. No two manufacturers are identical in size. There are also some members who are using 1/4" spacers. However, no one has determined if that is actually wise or not.

We have 1/2" wheel studs. The studs have 20 threads per inch. If you use a 1/4" spacer then you are effectively loosing 5 threads (full turns of the lug nut) to maintain the required clamping force of approximately 90-100 ft-lbs. Is that OK? I don't know for sure.

At the minimum, thread engagement length must be equal to or greater than the diameter of the fastener. In other words, if the stud is 1/2-inch in diameter, the nut must engage onto the stud by at least 1/2-inch. And that's not considering the additional load placed from off roading.

I'm not sure if our lug nuts have 1 full inch of threads or not. Nor, am I sure of how much thread on the stud protrudes past the lug (if any) since the lugs are capped. But if we assume that they currently engage with a full inch, then you would be loosing 25% of the threads. If they engage at less than 1", then you would be loosing more than 25% of the threads for clamping force.

That is why I'm not a fan of spacers on stock length wheel studs.

Talked to the guy over at BORA. No need for new studs. I'm ordering 1/4". And ordering tires. Done with waiting. I'm just gonna pull the trigger.

 

[NvrFinished]

They would be the one that have more info for sure. Did they tell you how much of O.E. lug nuts engage with the studs?

 

[Jms81661]

They would be the one that have more info for sure. Did they tell you how much of O.E. lug nuts engage with the studs?

Dammit, I forgot to ask. I mean they know the truck and rim size. It comes with the new studs pressed in. I would think that'd be enough. No?

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