Do 2021 TRX wheels fit on 2019 Big Horn

[Golfzilla184]

Help please, i found someone selling 2021 TRX wheels and need to know if they will fit my 2019 big horn.

 

[scottmoyer]

Are you getting wheels and tires? I just installed the TRX wheels on my Rebel, but the tires were the 275 series that came on the Rebel. I had absolutely no issues with the install. The Rebel wheels have a +19 offset and are 8" wide. The TRX wheels have a +19 offset and are 9" wide. So, there's an extra 1/2 inch of wheel inside and outside of where the original Rebel wheel would sit. From the factory, I had 3/4" from the tire to the UCA. Because of that extra 1/2" of wheel on the inside now, I have 1/4" between the tire and the UCA. I have no rubbing issues, or anything else since the tires remained the same diameter, just wider due to fitting the new 9" wheel instead of the original 8".

 

[Golfzilla184]

its factory 21 18" with tires Goodyear LT325/65r18 TPMS and lugs included

I have a factory 2019 Big horn 6 lug

 

[Scram1500]

There will be rubbing on those tires without a lift, might hit the upper control arm as well without spacers

 

[Shots]

The width won't fit either. 325 wide is going to contact the UCA without a wheel spacer.
IIRC the widest you can go with a factory offset wheel and no spacer is 295.

 

[Shots]

Doing some quick math based on the reported 3/4" of clearance on a stock tire:
295 = .35" clearance
305 = .15" clearance
315 = tire contact with UCA
325 = tire contact with UCA

That said I took measurements of my truck when looking at tires, and I was measuring a little less than 3/4" on stock wheels/tires. As a result I think that 305 was either unreasonable close or touching, so 295 is the widest you could safely run on a OEM offset wheel without a spacer.

Not to confuse things, but scottmoyer, if you didn't change the tire width and the offset is the same, there should be no difference in your clearance. Yes the wheel is wider and it will be 1/2" closer to the suspension, but the tire is the same so it will be unchanged.
To clarify:
On an 8" wide wheel the, 10.8" wide (275 mm) tire will overhang the wheel 1.4" inboard and outboard.
On a 9" wide wheel the 10.8" wide tire will overhang the wheel 0.9" inboard and outboard.
Therefor your logic is accurate that the 1" wider wheel will be 1/2" closer to the suspension (and 1/2" out too). However, if the offset is the same, the centerline is unchanged, and the wheel won't move closer/further from the suspension. The only difference is that the tire won't protrude over the wheel as far as it previously did. If you haven't changed the width of the tire or the offset you should have the same clearance with everything as you did before.

Does that make sense? I can try again if it didn't.

****EDIT:
See post #10 for clarification on wheel widths. There is a slight effect if you're using the same tire.

 

[Baker827]

They "fit" without spacers but the side wall does just barely touches the UCAs. I drove mine that way for 2 days until the spacers showed up but I only have a 2mile drive to work. It did leave a small mark on the sidewall but didnt cut into the tire. Pictured with 1.5in spacers which is over kill honestly a 1/2-3/4in spacer would be enough to clear UCAs

Edit: I should note that I have readylift UCAs which seem to have just a slight amount more clearance. Stock UCAs would contact the tire more.

 

[Baker827]

 

[scottmoyer]

@Shots, now that I think about it, you're right. The positive offset being the same on both wheels is from the centerline to the inside edge of the wheel, so +19 should give the same inside clearance. But it didn't. I lost 1/2". I looked online to find the offset of both wheels and found them both listed at +19, but are they really?

Editing this post to include "no spacer" measurement photo and the removal of the photo that didn't have a tape measure.

Here's my before measurement:

And here's the after.



And here's how it sits with 1.5" spacers. So maybe I only lost 1/4" (??)

 

[Shots]

Yes, 1/4" is much more likely due to the increased wheel width since the rim width does have a minimal effect on tire width if you're using the same tire. I forgot to consider that, which is where you're extra width is coming from.

Time to nerd out a bit for clarification.
Each tire has a measured rim width, and an approved rim range. What that means is the tire manufacturer will designate the tire size based on a given rim dimension. For example 275 wide on an 18 x 8 wheel but it's approved for use on different widths.
For example, the 275/70/18 Duratrac that comes on the Rebel has an approved rim width of 7.0 - 8.5, but it's spec sizes are based on an 8" wide wheel.
For every 1/2" deviation from the measured rim width, the tire will increase/decrease roughly 0.2". So using the example Duratrac (10.8" wide per Goodyear) measured on an 8" wheel (Rebel) and then remeasured on a 9" wheel (TRX) it will increase to 11.2" wide. That 0.4" equates to about 0.2" inboard and 0.2" outboard, which is the 1/4" (0.25") that you measured.
Keep in mind these are section width, not tread width. This is also assuming it's the same make/model tire with the same specs. If you used a 275 tire with a measured/recommended rim width of 9" it will measure narrower than your current tire.

Long story short, you've essentially made the 275 mm tire fit like a 285 mm tire. So yes, you were correct that the wheel width did effect how close that specific tire sat in relation to the suspension. I forgot to consider it's not the recommended wheel size. My apologies.

On a side note. The overall diameter isn't generally affected by the rim width. This is largely due to the steel belts which pretty much keep the tire in it's general shape. There is a measurable difference, but it's minute (IIRC hundredths of an inch).

 

[Golfzilla184]

So as an update. I think I've decides on what I'm doing wheel wise. Im really hung up on the KMC Mesa KM544s Id really like to go 18s but i really dont want to deal with spacers and off sets and the 20s come in a 0 offset. I found a guy below whos running those with 33x12.5 see the link below.

I think im going to go with the KO2 295/55/R20. At least by my math all should be free and clear on that size as they are a hair smaller than his 33x12.5
I should had im buying the readylift leveling kit also. Id appreciate anyones thoughts on this combo.

2019 Ram 1500 with 20x9 KMC Km544 and 33/12.5R20 Nitto Ridge Grappler and Leveling Kit | Custom Offsets

Check out this 2019 Ram 1500 4WD running KMC Km544 20x9 0 wheels and Nitto Ridge Grappler 12.5x33 tires with an OEM Leveling Kit.

www.customwheeloffset.com

 

[30THIRTY]

Doing some quick math based on the reported 3/4" of clearance on a stock tire:
295 = .35" clearance
305 = .15" clearance
315 = tire contact with UCA
325 = tire contact with UCA

That said I took measurements of my truck when looking at tires, and I was measuring a little less than 3/4" on stock wheels/tires. As a result I think that 305 was either unreasonable close or touching, so 295 is the widest you could safely run on a OEM offset wheel without a spacer.

Not to confuse things, but scottmoyer, if you didn't change the tire width and the offset is the same, there should be no difference in your clearance. Yes the wheel is wider and it will be 1/2" closer to the suspension, but the tire is the same so it will be unchanged.
To clarify:
On an 8" wide wheel the, 10.8" wide (275 mm) tire will overhang the wheel 1.4" inboard and outboard.
On a 9" wide wheel the 10.8" wide tire will overhang the wheel 0.9" inboard and outboard.
Therefor your logic is accurate that the 1" wider wheel will be 1/2" closer to the suspension (and 1/2" out too). However, if the offset is the same, the centerline is unchanged, and the wheel won't move closer/further from the suspension. The only difference is that the tire won't protrude over the wheel as far as it previously did. If you haven't changed the width of the tire or the offset you should have the same clearance with everything as you did before.

Does that make sense? I can try again if it didn't.

****EDIT:
See post #10 for clarification on wheel widths. There is a slight effect if you're using the same tire.

Is this for 2wd or 4wd and would there be a difference?

 

[Shots]

That was based on measurements taken from a 4wd, but if the 2wd has the same stock clearance it shouldn't make a difference.

 

[Mr. Ramrod]

@Shots, now that I think about it, you're right. The positive offset being the same on both wheels is from the centerline to the inside edge of the wheel, so +19 should give the same inside clearance. But it didn't. I lost 1/2". I looked online to find the offset of both wheels and found them both listed at +19, but are they really?

Editing this post to include "no spacer" measurement photo and the removal of the photo that didn't have a tape measure.

Here's my before measurement:

And here's the after.

View attachment 123219

And here's how it sits with 1.5" spacers. So maybe I only lost 1/4" (??)

View attachment 122893

Do you have any exterior pictures of them on your truck? I'm looking to do the exact same thing on my Limited with the Off-road option, which I think is raised 1". I am not planning to use spacers though...

 

[Mr. Ramrod]

@Shots, now that I think about it, you're right. The positive offset being the same on both wheels is from the centerline to the inside edge of the wheel, so +19 should give the same inside clearance. But it didn't. I lost 1/2". I looked online to find the offset of both wheels and found them both listed at +19, but are they really?

Editing this post to include "no spacer" measurement photo and the removal of the photo that didn't have a tape measure.

Here's my before measurement:

And here's the after.

View attachment 123219

And here's how it sits with 1.5" spacers. So maybe I only lost 1/4" (??)

View attachment 122893

They "fit" without spacers but the side wall does just barely touches the UCAs. I drove mine that way for 2 days until the spacers showed up but I only have a 2mile drive to work. It did leave a small mark on the sidewall but didnt cut into the tire. Pictured with 1.5in spacers which is over kill honestly a 1/2-3/4in spacer would be enough to clear UCAs

Edit: I should note that I have readylift UCAs which seem to have just a slight amount more clearance. Stock UCAs would contact the tire more.

Baker, what size tire do you have on them? Trying to figure out how to get these TRX rims on my 2023 Limited I just ordered. Thanks!

 

[jdcoronadom]

I have the TRX wheels on my big horn 2022, i installed a rough country 3.5” lift kit with new front/rear shocks, and new front arms, i needed a 1.5” spacers too
I will like the beadlock TRX wheels, but i need explore more because i did read that sometimes is ilegal ride with deadlock wheels and i don’t know yet it they are the same size

 

[Eighty]

I have the TRX wheels on my big horn 2022, i installed a rough country 3.5” lift kit with new front/rear shocks, and new front arms, i needed a 1.5” spacers too
I will like the beadlock TRX wheels, but i need explore more because i did read that sometimes is ilegal ride with deadlock wheels and i don’t know yet it they are the same size


View attachment 150828

The TRX wheels are beadlock capable. You can run them legally, as long as you don’t buy actual beadlock rings and flip the tires out to pinch them with the rings.

 

[mpriceii]

Just mounted a set of TRX takeoffs with new DuraTrac 285/75 tires to my stock 2019 Rebel. Tires fit perfect with zero rub anywhere. Truck is stock with no level, coil springs. Space between UCA is enough to get a finger through.

 

[HookedonRam]

Just mounted a set of TRX takeoffs with new DuraTrac 285/75 tires to my stock 2019 Rebel. Tires fit perfect with zero rub anywhere. Truck is stock with no level, coil springs. Space between UCA is enough to get a finger through.

I wonder if they would fit on my 2019 Ram 1500 4x4 if I were to install bilstein 6112s with readylift UCA and no wheel spacers.

 

[Julio13]

2021 ram big horn with 2” level and 1.5 spacers

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