Biggest Tires on Stock Ram 2500 4WD: Perfect FIT

The biggest tires you can fit on a Ram 2500 4×4 is a 35×12.5”. This will allow full lock-to-lock turning abilities without rubbing as well as full articulation and droop for off-road applications.

• The above-mentioned tire is for the radius arm Ram 4WD trucks from 2014 to the present 2500s and 2013 to the present 3500.
• The fitment guide in this article is not to determine how much you can get away with, however, it’s aimed at fitting the biggest tire possible without losing any practical application on the truck.

When you do a big tire upgrade, you aim to enhance the capabilities and looks of your 4-wheel drive truck.

Your 4WD should still be able to do an overland trip or the weekly mall-crawling trip without hassle.

You don’t want to lose practicality for everyday tasks yet you also want to improve the 4-wheel driveability and retain full wheel articulation for any off-road work.

The biggest tire you can fit on a stock Dodge Ram 4WD 2500 running OEM wheels is a 35×12.5”. This size eliminates any rubbing or trimming to make them fit.

This is the most convenient tire option without additional modifications required.

Things to Note:

• This size will work the same on the Power Wagon, 2500, and 3500 Ram trucks.
• It offers a nice balance between street, off-road, and practicality.

Maximum Tire Size On A Stock Ram 2500 Suspension With Small Modifications

Take note that to make the biggest wheel fit, you’ll have to accept there will be some light rubbing on the radius arm fastener, as well as wheel rub on the sway bar.

Things to Note:

• You should be prepared to do some trimming on the inside of the wheel fender liner.
• You can go as big as a 37×12.5” tire on the factory stock wheels.
• This will apply to 2500, and 3500 as well as Power Wagons on stock wheels.
• The wider offset factory wheel on the power wagon is going to make this easier and with possibly fewer modifications.

Maximum Tire Size On A Stock Ram 2500 4WD Suspension With Aftermarket Wheels

Now if you’re prepared to spend a bit more and do the modification a lot better, then you should opt for an aftermarket wheel with the correct offset.

This will negate the need to do much trimming and cutting of the wheel fender liner and will look so much better.

In this instance, you can push the upper limits of 35” tires.

Things to Note:

• The main thing here is the offset of the aftermarket wheel.
• The more (-)negative the wheel offset, the further out the wheel sticks out.
• The more (+)positive the offset the more flush the outside of the wheel sits relative to the body and hub.
• A negative offset wheel moves the centerline towards the inboard side of the rim, thus pushing your tires further out.
• Offset is the distance from the wheel mating surface to the center of the tire tread.

Hope that helps!

The maximum tire you can fit with an aftermarket wheel would be a 37×14.5” fitted on a wheel with an offset between +18mm and +27mm. Avoid all zero (0) offset rims and anything with a negative offset.      

Biggest Tires on Stock Ram 2500 4×4 (With a Lift)

When you go bigger than 37” you’ll need to add some length to the rear control arms to accommodate the bigger tires.

You might even need to extend the driveshaft when you run such a big tire.

Things to Note:

• There’s a lot more work involved in fitting 39” or 40s on a lifted truck.
• All the above-mentioned tire sizes right up to 37” with aftermarket wheels are applicable up to 3” lift.
• If you want to fit 40s on your 2500 Ram, you’ll need a bigger lift than 3”.
• We’re referring to 6” lifts combined with fender flairs,
• Extended control arms and extended driveshafts are also necessary.

Biggest Tires On Stock 2019 Ram 1500 4wd

Keep in mind once you fit a larger tire on your stock suspension and later decide to upgrade the suspension you won’t need to change anything in terms of bump stops, levels, wheel spacers, or make any wheel well modifications.

Will 35-inch Tires Fit a Dodge Ram 1500?

This is a hassle-free upgrade that allows for a wider and longer footprint, enhancing the truck’s off-road capability while still taking advantage of its suspension travel.

• The biggest tire recommended for a Ram 1500 with factory stock suspension is 35” x12.50 on factory stock rims.
• This allows you to lock the wheel without any trimming, rubbing, grinding away body panels, or adjustment of suspension components.
• This is a straight bolt-on-and-go tire option.
• A speedometer adjustment is needed to calibrate the reading.

Will 33’s Fit on Stock Dodge Ram 1500?

The simple answer is, yes.

As mentioned above, the 35” x12.5 is the biggest wheel you can fit without hampering off-road performance or any body-panel trimming required to make them fit on the stock wheels.

Things to Note:

• With a 33” tire, it will fit provided it has the correct offset to clear the brake calipers.
• The more positive the offset, the closer the inside of the wheel is aligned with the centerline of the tire.

Below are some measurements to help you understand the differences between a 33” and 35”

Measurement	33-Inch	35-inch	Difference
Diameter	285/75/17	305/75/17	+7%
Width	11.2”	12”	+7.1”
Sidewall	7.9”	9”	13.9”
Circumference	102.7”	109.9”	+7%
Revs/Mile	617	576	-41

I find this tool very useful when determining tire size differences and what effect it has on your truck:

Next, let’s investigate the biggest tires you can squeeze on a Ram 1500 with a stock suspension.

Biggest Tire Size on Stock Ram 1500

So this is probably one of the most commonly asked questions on all discussion forums and FB groups.

Every guy wants to know what the biggest tires are he can get away with on a factory stock suspension and stock wheels.

If you are prepared to live with the following:

• Rub on the sway bar
• Rub on the radius bar fastener
• Light trimming inside the wheel well liner

The biggest tire you can fit on a Ram 1500 with stock rims is 37”x12.5 

NB: As mentioned, you will need to do a little bit of trimming on the inside fender liner.

This applies to 2500, 3500, and Power Wagon stock wheels.

The Power Wagon wheel has a slight advantage since it has a wider offset wheel in stock form, meaning there is a bit more backspace clearance.

Final Thoughts

Going bigger tires on your 4-wheel drive might look awesome, however, you want to limit how big you go, especially if you still want to maintain the full off-road functionality of your truck.

Bigger isn’t always better since the bigger you go, the more modifications you’ll need to make as well as adjusting your speedometer reading.

For the best all-around upgrade, we recommend not going bigger than 37”