The Jeep Gladiator max tire size for a stock vehicle without a lift kit is determined by finding the largest tires that can fit on the vehicle without any modifications to the suspension or body.
For the sake of the article, let’s assume you want the biggest tire that covers both on-road and most off-road applications.
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Biggest Tires To Fit A Stock Jeep Gladiator (Without a Lift Kit)
Fortunately, the Gladiators have a lot of room for modifications and can accommodate a wide variety of tire sizes due to their suspension setup and arch clearance. This, however, does not mean you should try and squeeze the biggest tire onto the vehicle.
- You should ask yourself what the main application of the vehicle is
- Will you be towing, overlanding, show and shine, or doing serious off-roading aka “wheeling”?
- Each application has a different tire size recommendation.
Biggest Tire on a Jeep Gladiator Sport S
Being a pickup truck, the rear suspension of the Gladiator sits roughly 1.5 inches taller than the front. It is designed that way to allow you to load up the rear to the maximum carrying capacity and allow the truck to level out with the front without too much rear droop.
When running stock wheels and stock suspension on your Gladiator Sport you can safely consider the following Jeep Gladiator tire size options without any additional modifications:
|This tire size indicates a tire width of 285 millimeters, an aspect ratio of 70 (the tire’s height is 70% of its width), and a 17-inch rim diameter. It provides a good balance between width and sidewall height, suitable for various off-road and on-road applications.
|This tire size specifies a wider tire with a width of 295 millimeters, the same aspect ratio of 70, and a 17-inch rim diameter. It offers increased width compared to the previous size, potentially providing better traction and stability, especially in off-road conditions.
|With a width of 285 millimeters, a higher aspect ratio of 75 (indicating a taller sidewall), and a 17-inch rim diameter, this tire size has a taller profile compared to the 285/70. The increased sidewall height might enhance off-road performance by offering more cushioning and ground clearance.
There are unfortunately some cons to fitting Jeep Gladiator big tires. Fitting larger tires to your Jeep will negatively affect the following areas:
The below table describes how bigger tires can affect gas mileage, braking distance, and acceleration performance on a 4WD vehicle:
|Effect of Larger Tires
|Generally decreases. bigger tires result in a change in the final drive ratio, causing the engine to work harder to turn the wheels. This increased effort can lead to a reduction in fuel efficiency, resulting in lower gas mileage compared to using smaller tires.
|Potentially increases. Bigger tires can increase the overall weight of the vehicle and alter the brake force distribution. This change may lead to a longer braking distance as more force might be required to stop the vehicle due to the increased rotational mass.
|May decrease. Larger tires add more weight and rotational mass, which can impact the vehicle’s ability to accelerate quickly. The increased weight and altered gear ratios may result in slower acceleration times, affecting the overall performance by requiring more effort from the engine.
Please note that the effects mentioned can vary depending on the specific tire size, vehicle model, engine capacity, diesel vs petrol, gear ratios, and other factors such as tire pressure, tread pattern, and overall tire construction.
If you are considering going as big as 315/70,17 on your Sport then be prepared to have minor rubbing and you’ll reach the maximum that you can go on a stock Sport with stock wheels.
Biggest Tire on a Gladiator Rubicon
Rubicon models have more fender clearance and a higher suspension in stock form than the Gladiator Sport.
- On the Rubicon/Mojave models, a lift kit is not necessary for 35s and the transmission ratios of 4.10 are short enough to pull the heavy 35s without any hassles.
- 35” tires are the most practical all-rounders for towing, off-road, and daily driving applications on these trucks.
- They look pretty good too.
If you intend on going bigger than 35-inch tires like say, 37-inch then you’ll need to do a few more modifications and fork out a lot more of your hard-earned cash to make them function properly.
Will a Gladiator Rubicon’s Tires fit a stock Gladiator Sport?
Yes, stock Rubicon tires are roughly 33 inches in size. They are 285/70/17 and only 0.25” or 6.35 millimeters taller than the stock 245/75/17 Sport/Sahara/Overland tires. This means that Rubicon tires are compatible with any Gladiator Model without any additional modifications to make them fit.
Larger tires vs Speedometer Reading – 33” and 35” tires
The below table will give you an indication of how the speedometer reading is affected between a 33” and a 35”.
|33” Speedo reading
|35” Speedo Reading
Difference Between 33″ and 35″ Tires (Size/Height/Weight)
When it comes to big tire upgrades, everyone seems to be hell-bent on oversized tires and big lifts. There are pros and cons of 33” tires vs 35” tires and the physical differences between the two. How big of a difference does that extra 2″ of tire clearance make on the trail?
Now that might not sound like a lot, however, that 1 inch can mean the difference between being hung up and just managing to scrape over the obstacle. So are big tires the holy grail of off-roading or are there other components and factors that are just as important?
Conclusively, larger wheels enhance aesthetics, handling, off-road capability, and towing performance if installed correctly within manufacturer guidelines. However, expect potential drawbacks such as reduced acceleration, braking efficiency, and decreased fuel efficiency when fitting oversized tires.
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