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Maximum oversized tires without modifications

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Bkslayer

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I own a 2019 Ram Power Wagon (completely stock). I’m trying to find out what the maximum tire size I can upgrade to, without making a modifications to my stock truck..... Any input would be greatly appreciated!
 
35x12.50x17 are likely the widest tire given stock front suspension.

37 inch tires will fit stock in the back but front would need a lift and potentially a different wheel offset.


I have 35x12.5x17 on my 2019 Power Wagon and have since I purchased it (had the dealer swap on delivery)
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Sent from my SM-G998U using Tapatalk
 
37s do not need a lift to fit. You will need the wheel to be in a +18 to +25 offset (I believe those are the correct numbers, but could be off a mm or two). You would also need to mod the back of the front wheel wells, at a minimum heating up the fender liner and pushing it back, potentially needing to bend the pinch weld over. That's not a lot of work to fit 37s. 35s however are throw on and go.
 
dave41079 said:
37s do not need a lift to fit. You will need the wheel to be in a +18 to +25 offset (I believe those are the correct numbers, but could be off a mm or two). You would also need to mod the back of the front wheel wells, at a minimum heating up the fender liner and pushing it back, potentially needing to bend the pinch weld over. That's not a lot of work to fit 37s. 35s however are throw on and go.
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Thuren mentioned that the front end may see some damage with 37s while off-road if you don't adjust the axel with a lift.

Have you confirmed you can wheel with 37s?

I am thinking of going with the AEV rims that are specifically designed to fit 37s on a stock PW in the front but was concerned about full articulation.

That said I now have an aftermarket bumper so it may be a moot point.

Sent from my SM-G998U using Tapatalk
 
pdavey said:
Thuren mentioned that the front end may see some damage with 37s while off-road if you don't adjust the axel with a lift.

Have you confirmed you can wheel with 37s?

I am thinking of going with the AEV rims that are specifically designed to fit 37s on a stock PW in the front but was concerned about full articulation.

That said I now have an aftermarket bumper so it may be a moot point.

Sent from my SM-G998U using Tapatalk
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Numerous folks with 37s on stock suspension Power Wagons on here, Expedition Portal, and other places with no problems. I'd have them on mine, but then I wouldn't fit into the parking garage at work.
 
dave41079 said:
Numerous folks with 37s on stock suspension Power Wagons on here, Expedition Portal, and other places with no problems. I'd have them on mine, but then I wouldn't fit into the parking garage at work.
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Well there is that.

I tow with my rig so going to 37s means also going to 5.12 gearing ratio. Maybe this spring.

Good to know fitment works with the offset.

Sent from my SM-G998U using Tapatalk
 
pdavey said:
Well there is that.

I tow with my rig so going to 37s means also going to 5.12 gearing ratio. Maybe this spring.

Good to know fitment works with the offset.

Sent from my SM-G998U using Tapatalk
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dave41079 said:
37s do not need a lift to fit. You will need the wheel to be in a +18 to +25 offset (I believe those are the correct numbers, but could be off a mm or two). You would also need to mod the back of the front wheel wells, at a minimum heating up the fender liner and pushing it back, potentially needing to bend the pinch weld over. That's not a lot of work to fit 37s. 35s however are throw on and go.
Click to expand...
Depends on the tire actual size lots of 37s are basically 35s
 
pdavey said:
Well there is that.

I tow with my rig so going to 37s means also going to 5.12 gearing ratio. Maybe this spring.

Good to know fitment works with the offset.

Sent from my SM-G998U using Tapatalk
Click to expand...
FYI it doesn’t sound like anyone makes gearing a 2019+ power wagon rear axle yet...Yukon told me the rear pinion, axles, etc are different, but they haven’t been able to get their hands on a full axle yet to check it all out, and therefore they don’t have gearsets available yet for 2019+ power wagons
 
I have aev wheels and toyo 35’s on stock 2020 there is no way I could offroad without major rubbing with 37’s
 
pdavey said:
Nice. What type of rubbing do you have?

Also love your username

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It's so minimal that I haven't bothered looking into it yet but the way it feels/sounds, I suspect it is rubbing the radius arm.
 
The AEV wheel's 17x8.5" back spacing is advertised at 5.8" and the stock wheel is 6.3" (calculated from 45.72mm offset). We must be careful when talking back spacing vs offset. as the wheel width changes everything, so you cannot really compare them side by side. The stock wheel sits 0.5" farther inward than the AEV. The AEV is 0.5" wider so the outside edge of the wheel should be a total 1" farther outward. The 0.5" of back spacing you are not getting from the AEV wheel is what is causing your tire to rub on the radius arm (if it does) with the stock wheel.

I had the same issue with the stock wheels and 12.5" wide tires on my RAM 1500 (not radius arms, but you get the concept). I added a 1/4" spacer to the front wheels and that did the trick. The 1/4" spacer is arguably a bad idea, but I ran them for many miles including off-road without issue. I certainly would not run a thicker spacer than that, and many will pounce on this as a terrible idea anyway.

If one decided that a 1/4" spacer was an option, the question would be, is this enough to fix the rubbing issue under full lock? Every tire is different and couple that with fabrication tolerances, and you have a trial and error situation. If it is, and you are comfortable with it, then you saved yourself about $1k in wheels. If it does not, then you are out $40, and have to buy wheels anyway.
 
btsbarton said:
Sweet looking truck...what topper is that?
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Thanks!

It's a Ranch XD topper, IMO Ranch makes an excellent product. It came on the truck when I bought it and I have since sold the topper. If I decide to run one in the future, I'll look for a bed height topper.
 
GeneralClortho said:
The AEV wheel's 17x8.5" back spacing is advertised at 5.8" and the stock wheel is 6.3" (calculated from 45.72mm offset). We must be careful when talking back spacing vs offset. as the wheel width changes everything, so you cannot really compare them side by side. The stock wheel sits 0.5" farther inward than the AEV. The AEV is 0.5" wider so the outside edge of the wheel should be a total 1" farther outward. The 0.5" of back spacing you are not getting from the AEV wheel is what is causing your tire to rub on the radius arm (if it does) with the stock wheel.

I had the same issue with the stock wheels and 12.5" wide tires on my RAM 1500 (not radius arms, but you get the concept). I added a 1/4" spacer to the front wheels and that did the trick. The 1/4" spacer is arguably a bad idea, but I ran them for many miles including off-road without issue. I certainly would not run a thicker spacer than that, and many will pounce on this as a terrible idea anyway.

If one decided that a 1/4" spacer was an option, the question would be, is this enough to fix the rubbing issue under full lock? Every tire is different and couple that with fabrication tolerances, and you have a trial and error situation. If it is, and you are comfortable with it, then you saved yourself about $1k in wheels. If it does not, then you are out $40, and have to buy wheels anyway.
Click to expand...
Spacers are fine as long as they are quality and you have enough thread engagement on the lug. By quality I mean that they are well machined and dead flat.
 
dave41079 said:
Spacers are fine as long as they are quality and you have enough thread engagement on the lug. By quality I mean that they are well machined and dead flat.
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Bolt on spacers are great but spacers that use the existing studs like 1/4” spacers should be steel the soft aluminum can cause issues i usually cut them out of plate on the plasma table
 
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