Rim offset and backspacing to fit 37s

bmhenry

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need to know the year.. assuming 2021.. From the Don Thuren Bible..

Wheel And Tire Fitment For The 2013+ 3500, 2014+ 2500 Trucks Including Power Wagon: 0-3" Lift

At 57mm, the stock wheel setup for the 2013+ 3500 and 2014+ 2500 will require a +18 to +25 millimeter offset range in order to achieve proper fitment. The same goes for the Power Wagon which in stock form has a +42 to +57 millimeter wheel offset.

The +18mm to +25mm offset will give the best overall clearance for tire and wheel combinations once you install a 0 - 3 inch lift. The above-mentioned platforms clear stock tire setups better than the Pre-2013 models. Most trucks come from the dealer with 34 inch diameter tire sizes, therefore fitting 35 inch tires are out of the question...mostly.

A 35 x 12.5 tire size wrapped around stock rims will fit but will also rub on the radius arms. The same goes for a 37 x 12.5 inch tire size on a stock setup; however, it’s guaranteed that the turning radius will suffer dramatically coupled with rubbing on the sway bar and radius arm.

Applying a +18mm offset to a set of aftermarket wheels and a 37 x 12.5 inch tire diameter fits nicely with zero contact on the radius arm or sway bar. If it rubs at all through the vertical range of motion it’ll be very slight.
 

22hemi13

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Not on a 2500 with 37s…unless you trim a bunch lol
Or have a stupid amount of lift.
Yep. I had to cut a lot to clear my 37s on -19 when I went to 39s I cleared even more. I did it good cause I’m on 40s now and didn’t cut anymore. But switched from a -19 wheel to a 0 offset wheel.
 

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Great info here

 

62Blazer

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Search for CJC Offroad on the website as they have several videos of running 37's on the Ram's and explain how the wheel offset affects it.
 

olyelr

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I should clarify.. it is a power wagon.
Unless you go with a full on “lift” with bumpstop drops etc., there really is no difference.

The factory fenders fit 37’s pretty much perfectly. It all depends on you wheels tho…high offset and backspacing can make a set of 33’s rub…
 
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