The F250, a popular truck, sees many owners upgrading to 37” tires to enhance its appearance. These larger tires suit the truck’s size well, also improving its aesthetics. Looking to fit 37s? What wheel choices do you have?
These offsets with zero rub are very popular with these 37×12.5s. There might be some minor plastic trim required, depending on which offset rim you opt for and how aggressive the tire tread pattern is.
Let’s now look at your fitment options in a bit more detail.
Table of Contents
Will 37s Fit On A Leveled F250 – ALL YOU NEED TO KNOW
After extensive research on this topic, the variety in truck setups is fascinating. Some have fitted a 2.5″ ReadyLift kit with 37s on a stock truck, making it resemble a 35s setup with no scrub.
Regarding wheel sizes, does the difference between 20×9 and 20×10 impact fitment, or is it solely the tire width that matters?
Let’s look at 2 popular options
|Track Bar Bracket
|Fuel, 20 X 9
|Toyo, 37 X 12.5 X 20
If you opt for a 20×10 rim then go for a more negative offset rim to keep scrub at a minimum. Of course, the opposite applies as well.
|2.5 Inch Readylift kit
Will 37s Fit On A Leveled F250 – Leveling Kit
When fitting a leveling kit to the front, some owners have reported the truck stance to be a little nose-high. This can happen depending on the truck’s year model, so keep that in mind before going too high on the front.
When addressing the rear suspension, consider adding a rear block to level or lift the truck for an improved stance. Vehicle year models dictate the height variation of rear blocks.
For instance, the 2020 F250 utilizes a shorter rear block, with a 2″ rear block proving successful. In contrast, earlier models from 2017-19 may need a taller 3.25″ or 4″ rear block, which doesn’t negatively impact the use of 37s.
Fitting 37s on Stock Rims
To run 37s with stock rims, the Nitto Trail Grappler MT 37/11.5 r20 is a widely reported option without rubbing. Its 11.5-inch width prevents clearance issues. However, choices for this setup are limited.
Staying with stock wheels? A 2-inch leveling kit is needed for 37s. Using 18” factory rims? Employ a 1/4″ wheel spacer to widen the wheels with 18X8 factory wheels for better clearance and offset.
Will You Need Caster Shims When Lifting Your F250?
When lifting trucks, especially those with IFS setups, the suspension geometry changes. A leveling kit impacts the caster and stability. Using 2° caster shims after installation is advised to restore factory angles and avoid the “death wobble.” It’s an affordable add-on with various aftermarket choices.
Our 2.5″ lift systems come with a 2° shim, restoring the caster and increasing it by 1° from stock settings for better tire tracking.
Which Wheel Offset Works?
20×10 with a -18 offset combined with 37×12.50 AT tires requires a minimal amount of plastic trimming. The upside to this configuration is in most cases there shouldn’t be any rub on the UCA arms at full lock.
If you opt for wheels with less offset, in most cases there’s no need to trim anything for the 37s to fit. If you opt for anything more than -18 like say a -24 offset wheel, be prepared to do some minor trimming.
Will You Need To Trim Anything?
Cutting up your truck is never fun no matter how minimal they are. In some cases, however, again, depending on offset, tire choice, etc., you will be required to trim the area where your front mud flaps mount. Be prepared to take about an inch off.
There will be a slight rub occasionally when turning at full lock while backing uphill. To prevent this, as mentioned above, you need the correct offset and aftermarket radius arms to get no rub.
For this job, you will need a decent heat gun and Dremel Cutting tool. If you don’t already own one then I would recommend you check out this Top-Selling Infrared Thermo gun on Amazon with almost 17000 good ratings. Also, for trimming fender liners i recommend investing in this Dremel Variable Speed Cutting Tool (Amazon) It will give you better control than an aggressive grinder leaving your trimming looking a lot more professional and neat.
Will You Lose Power After Fitting 37s
Some F250 owners noted sluggishness switching to 37s from 35s, but not when towing. Dyno tests by other owners showed no power loss. The heavier 37s affect unladen weight, potentially reducing fuel economy by 1-2 MPG.
As mentioned from the outset the largest you can fit without scrubbing or cutting of wheel arch plastic is the 34” on a 16” inch rim. (eg. 315/75/16) The most popular combinations of 34” can work.
If you are prepared to remove the mud flaps, you can go slightly wider with a 295 tire on an 18” profile. Once you install a small 2” lift your tire and rim options immediately widen, so let’s see what your options are.
F250 User Experiences/Feedback
Let’s look at a few real-world examples of F250 owners who have fitted 37s and their experience.
F250 User Experiences/Feedback #1
I was ready to pull the trigger on the 2020 until I read about the height reduction and it has me concerned and wondering if I need to go with a 2019 instead. I currently run a 2018 with 2.5″ Readylift up front, rear is stock… on 295/65/20 Ridge Grapplers and OEM aluminum wheels.https://www.ford-trucks.com/forums/1616773-anybody-leveled-a-2020-and-done-37s-yet.html
I was wanting to run a 2020 with the same Readylift setup but go with 37×12.50R20 Ridge Grapplers on OEM Aluminum wheels, but am worried they might not fit like they would on the 2019 model (I know there will be rubbing on 2019 on radius arms). Has anyone done a 2.5″ Readylift on a 2020 with 37×12.50s yet? I haven’t seen any on what limited social media I can see through Google searches and haven’t seen anything but 35s on 2020s here. Picture examples would be excellent, particularly on stock OEM wheels.
F250 User Experiences/Feedback #2
I just picked up a new F-250 Lariat offroad, crew cab with the snow plow prep, I installed a 2″ kit up front, stock rear blocks and am running 37″x 12.50’s with no problem at all plenty of clearance. Paulhttps://www.ford-trucks.com/forums/1616773-anybody-leveled-a-2020-and-done-37s-yet.html
F250 User Experiences/Feedback #3
The ride is great! Very smooth and comfortable and the mud tires are way more quiet than what I thought they would be. The only thing that I’ve noticed is the revs of the rpm’s is low she lives around 1600-1800rpm’s. Its hard for me to reach 2000 rpm’s and when I do its not for very long as I have way exceeded the speed limit by then. I can notice just slightly a lag in early acceleration, but she still has the power to get up and go too.https://www.ford-trucks.com/forums/1616773-anybody-leveled-a-2020-and-done-37s-yet-2.html
Another things is that its difficult to get out of 9th, not seeing 10th very often and when I do I’m exceeding 80mph. But as for gearing up and shifting I don’t notice it shifting they only time I notice it is when I and decelerating or breaking roughly around 50 to 30mps and then its has rough downshifting and what I think is high rpm revs to be in those lower speeds and not giving it gas. I can be around the 40s on the speedometer and its still in 7th gear.
Now that being said I have not calibrated the speedo yet either and I want to say its a 3.31 gear ratio, I have to confirm that, so maybe I need to look into having the gear ratio changed as well. Still green with diesels and swapping out parts for aftermarket. Been doing a lot of reading on here and researching and learning how the whole forscan works so I can doing a bit of mods myself.
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