The Jeep Gladiator stands out as one of the most versatile midsize trucks available. Whether you use it for daily driving, off-roading, or towing, tire size plays a big role in how your Gladiator performs.
Many owners wonder what tire sizes fit best, what’s recommended by Jeep, and how changing tire size affects ride, speed, and safety.
Let’s explore the key facts, options, and tips to help you pick the right tires for your Gladiator.
Factory Tire Sizes For Jeep Gladiator
Jeep offers the Gladiator in several trims, including Sport, Overland, Rubicon, and Mojave. Each trim comes with a specific factory tire size designed for its purpose.
Here’s a quick look at the most common stock tire sizes:
| Trim | Stock Tire Size | Wheel Size |
|---|---|---|
| Sport | 245/75R17 | 17-inch |
| Overland | 255/70R18 | 18-inch |
| Rubicon | 285/70R17 | 17-inch |
| Mojave | 285/70R17 | 17-inch |
Sport models come with narrower, taller tires, while Rubicon and Mojave trims have wider, more aggressive all-terrain tires. These factory sizes provide a balance between comfort, fuel economy, and off-road ability.
Upgrading Tires: What Fits Without Mods?
Many Gladiator owners want bigger tires for better looks and off-road traction. But how big can you go without modifications?
Most experts agree you can fit up to a 33-inch tire (like 285/70R17) on all Gladiator trims with stock suspension and no rubbing. This is the standard size on Rubicon and Mojave models.
If you want to go larger, up to a 35-inch tire (like 315/70R17), you usually need a small lift kit (2-2.5 inches) and possibly new wheels with less backspacing. Bigger tires can rub at full turn or when flexing off-road if the suspension is not upgraded.
Here’s a comparison of common tire upgrade sizes:
| Tire Size | Diameter (inches) | Lift Needed? |
|---|---|---|
| 285/70R17 | 32.7 | No |
| 315/70R17 | 34.4 | 2–2.5” |
| 37×12.50R17 | 36.8 | 3.5”+ |
Non-obvious insight: Even if a bigger tire fits, the wheel’s offset and backspacing matter. Stock wheels may not fit wide tires without spacers, which can affect handling and wear.
Effects Of Changing Tire Size
Switching to a different size tire changes more than just appearance. Here’s how tire upgrades can affect your Gladiator:
- Speedometer Accuracy: Larger tires make your speedometer read lower than your actual speed. For example, upgrading from a 32” to a 35” tire means when your speedometer says 60 mph, you might be going closer to 65 mph.
- Fuel Economy: Bigger, heavier tires reduce fuel efficiency by 1-2 mpg or more.
- Acceleration & Braking: Larger tires can make your Gladiator feel slower and take longer to stop.
- Suspension & Steering: Oversized tires can stress stock parts. Ball joints, tie rods, and bearings can wear out faster.
You can fix speedometer and transmission issues with a recalibration tool, which resets the vehicle’s computer for the new tire size.
Off-road Vs. Highway Tire Choices
Choosing the right tire is not just about size—tread pattern and sidewall strength matter too. Here’s a breakdown of popular types:
- All-Terrain Tires: Great for mixed use, quiet on highways, and good off-road grip.
- Mud-Terrain Tires: Aggressive tread for mud, rocks, and sand, but noisier on roads.
- Highway Tires: Best for daily driving and long trips, but limited off-road traction.
Rubicon and Mojave trims come with all-terrain tires designed for tough trails. If you mostly drive on pavement, you might prefer an all-season or highway tire for better comfort and fuel savings.
Pro tip: If you air down your tires for off-roading, make sure your tires have strong sidewalls to avoid damage.
Common Tire Upgrade Mistakes
Many new Gladiator owners make mistakes when changing tire size. Here are two that are often overlooked:
- Not checking spare tire fit: Larger tires may not fit under the truck in the factory spare location.
- Ignoring gear ratios: Bigger tires can change how hard the engine works, especially on hills. If you upgrade to 35” or larger tires, consider re-gearing for better performance.
Avoid these issues by planning your upgrades and checking with an experienced shop or Jeep forum.
Recommended Tire Brands And Models
Some popular tire choices for Jeep Gladiator owners include:
- BFGoodrich All-Terrain T/A KO2: Excellent off-road and long tread life.
- Falken Wildpeak A/T3W: Good balance of off-road ability and quiet highway ride.
- Goodyear Wrangler Duratrac: Aggressive look and strong off-road grip.
Always check load ratings and tire reviews before buying. For more details, visit the official Jeep Gladiator page.
Frequently Asked Questions
What Is The Largest Tire I Can Fit On A Stock Jeep Gladiator?
You can usually fit a 33-inch tire (285/70R17) on all Gladiator trims with no lift or modifications. Anything larger may require a suspension lift.
Do Bigger Tires Affect My Jeep Gladiator’s Warranty?
No, simply installing larger tires does not automatically void your warranty. However, if a problem is caused by the tires or related modifications, it may not be covered.
Will Bigger Tires Hurt My Gladiator’s Gas Mileage?
Yes, larger and heavier tires can reduce fuel economy by 1-2 mpg or more, depending on how much larger they are than stock.
Can I Use My Stock Wheels For Bigger Tires?
You can use stock wheels for slightly larger tires, but very wide or tall tires may need wheels with less backspacing or spacers to avoid rubbing.
Should I Regear My Gladiator After Installing Larger Tires?
If you go up to 35 inches or higher, re-gearing is recommended for better power and transmission performance, especially if you tow or drive in hilly areas.
Choosing the right tire size for your Jeep Gladiator is about more than looks. It affects how your truck drives, how comfortable it feels, and even how long parts last. Think about your main use off-roading, daily driving, or towing before making a change.
With the right tires, your Gladiator will handle almost anything you throw at it.
