Jeep Gladiator Tire Size Guide
Factory tire sizes, the biggest tire that fits at each lift height, and what bigger tires change on your Jeep Gladiator, backed by 64 real Gladiator builds.
Quick Answer
Rubicon and Mojave Gladiators run 35 inch tires on the stock suspension, and we've installed 37s on a stock Mojave with no trimming. For 37s on any trim, a 3 to 3.5 inch lift is the cleanest route: in 64 owner-reported Gladiator builds, all 6 trucks on 37s with a 3 to 3.5 inch lift reported no rubbing and no trimming. Sport and Willys trucks generally need a 2 to 2.5 inch lift for 35s, though some owners run them on stock suspension.
Table of Contents
- What You Need to Know First
- Which Option Is Right for You?
- Tire Size by Lift: Real Build Data
- How Tire Size Affects Your Gladiator
- Supporting Parts You May Need
- Fitment Considerations
- Common Mistakes
- Recommended Setup Paths
- Shop Related Parts
- Frequently Asked Questions
- Related Guides
- Sources & Technical References
1. What You Need to Know First
Every Gladiator leaves the factory on 17 to 20 inch wheels with tires between about 31.5 and 32.7 inches tall. How much bigger you can go depends on your trim, your suspension and your wheel offset, not on tire size alone.
| Trim | Factory Tire | Approx. Height |
|---|---|---|
| Sport, Sport S | 245/75R17 | 31.5 in |
| Sport S (18 in option) | 255/70R18 | 32.1 in |
| Willys, Texas Trail, High Tide | 255/75R17 | 32.1 in |
| Nighthawk | 275/55R20 | 31.9 in |
| Rubicon, Rubicon X, Mojave, Mojave X | 285/70R17 | 32.7 in |
Tire labels are not exact. A "35 inch" tire can measure anywhere from about 34.4 inches (315/70R17) to a true 35, and a tire that runs true to size needs more room than one that runs small. When a build is close, measure.
2. Which Option Is Right for You?
The right tire depends on how you use your Gladiator. Here's a quick breakdown.
3. Tire Size by Lift: Real Build Data
This table summarizes 64 owner-reported Jeep Gladiator builds (2020 to 2025), counted by suspension and tire size. "Rubbed" includes slight rubbing at full steering lock.
| Suspension | 33 in | 35 in | 37 in | 38 in and up |
|---|---|---|---|---|
| Stock | 3 builds · 1 rubbed | 10 builds · no rubbing, 1 trimmed | 1 build · 1 rubbed, 1 trimmed | – |
| Leveling kit | 1 build · no rubbing | 4 builds · no rubbing | 3 builds · no rubbing | – |
| 2 to 2.5 in lift | 2 builds · no rubbing | 10 builds · 2 rubbed | 5 builds · 2 rubbed, 1 trimmed | – |
| 3 to 3.5 in lift | – | 7 builds · no rubbing, 1 trimmed | 6 builds · no rubbing | 4 builds · 1 rubbed, 1 trimmed |
| 4 in lift and up | – | 1 build · no rubbing | 2 builds · no rubbing | 5 builds · 1 rubbed, 2 trimmed |
The pattern is clear: 35s are easy on almost any setup, 37s are clean on a leveled Rubicon or Mojave or on a 3 to 3.5 inch lift, and 38s and up need 3.5 inches or more and often trimming.
4. How Tire Size Affects Your Gladiator
Bigger tires add ground clearance and traction, but they also change gearing, braking, speedometer accuracy and what fits in the wheel well.
Tire Sizing
Flotation sizes like 35x12.50R17 give height, width and wheel size directly. Metric sizes like 315/70R17 give width in millimeters and sidewall height as a percentage of width. A 315/70R17 is about 34.4 inches tall, a 285/75R17 about 33.8 inches.
Wheel Offset
Factory Gladiator wheels have a high positive offset that tucks the tire in toward the frame. Bigger tires need a lower offset to clear the control arms and frame at full steering lock. The most common setup in our build data is 17x9 with a -12 offset (13 builds), and most trucks on 37s run -12 to -18.
Load Range
The Gladiator carries payload and tows, so tire load rating matters more than on a Wrangler. Load range E tires handle more weight but ride stiffer and weigh more; C or D ratings ride softer for lighter use.
Gearing
A taller tire works like a taller gear, so the truck accelerates slower and works harder when towing. Whether you need a re-gear depends on your engine, transmission, tire size and how you drive. Call us and we'll recommend a ratio for your truck.
Speedometer
With bigger tires the speedometer reads slower than your actual speed, and shift points move. A recalibration tool or tuner sets the new tire size in the truck's computer.
5. Supporting Parts You May Need
Depending on your tire size, these parts help your Gladiator clear, carry and drive on bigger tires.
6. Fitment Considerations
- Trim matters most. Rubicon and Mojave trucks have the most room. Sport and Willys trucks generally need a 2 to 2.5 inch lift for 35s, though our build data includes a Willys and an Overland running 35s on stock suspension with no rubbing.
- Width and offset cause the rubbing, not height alone. A 13.50 inch wide 37 needs more room at full lock than a 12.50 inch wide one.
- Check the rear under load. A loaded bed compresses the rear springs, so check rear tire clearance with your normal load.
- Spare tire. A full-size spare in the new size may need a different mount under the bed.
7. Common Mistakes
- Buying tires before checking offset. The right tire on the wrong wheel offset rubs at full lock.
- Trusting the label. Two "35s" from different brands can differ by more than half an inch in height.
- Skipping the speedometer fix. The truck reads slow and shifts at the wrong points until it's recalibrated.
- Chasing tire size instead of the whole setup. Big tires without the right lift, bump stops and geometry correction ride worse and wear parts faster.
8. Recommended Setup Paths
Rubicon or Mojave, stock or leveled
- TeraFlex 1.5 in leveling kit (optional)
- 35 or 37 in tires
- 17x9 wheels, -12 offset
Any trim, 35s
- TeraFlex 2.5 in Trail Select Sport Kit
- 35 in all-terrain tires
- 17x9 wheels, -12 offset
Any trim, 37s
- TeraFlex 3.5 in Trail Select Adventure Kit
- 37 in tires
- 17x9 wheels, -12 to -18 offset
9. Shop Related Parts
10. Frequently Asked Questions
What is the biggest tire that fits a stock Jeep Gladiator?
On Rubicon and Mojave trucks, 35 inch tires fit the stock suspension, and our shop has installed 37s on a stock Mojave with no trimming. In 64 owner-reported Gladiator builds, 10 ran 35s on stock suspension and none reported rubbing.
What size tires fit a leveled Jeep Gladiator?
35s fit a leveled Gladiator easily, and 37s are possible on Rubicon and Mojave trims. All 3 leveled builds on 37s in our data reported no rubbing and no trimming.
Can I fit 37s on a Jeep Gladiator?
Yes. A 3 to 3.5 inch lift is the cleanest route: all 6 builds on 37s with a 3 to 3.5 inch lift reported no rubbing and no trimming. Rubicon and Mojave trucks can also run 37s on a leveling kit.
What wheel offset works for 35s and 37s on a Gladiator?
The most common setup in our build data is a 17x9 wheel with a -12 offset, used on 13 builds. Most Gladiators on 37s run offsets between -12 and -18.
Do I need to re-gear my Gladiator for bigger tires?
Bigger tires lower your effective gear ratio, which slows acceleration and adds strain when towing. The right ratio depends on your engine, transmission, tire size and how you drive, so call us and we'll recommend one for your truck.
Do bigger tires affect my Gladiator's speedometer?
Yes. Taller tires make the speedometer read slower than you're actually going, and they change shift points. A recalibration tool or tuner corrects the tire size in the truck's computer.
11. Related Guides
12. Sources & Technical References
- Factory tire sizes by trim: Goodyear vehicle lookup, 2025 Jeep Gladiator
- Build data: 64 owner-reported Jeep Gladiator wheel and tire builds, 2020 to 2025 model years, compiled by Offroad Source.
- Offroad Source install shop, Paulding, Ohio: Gladiators we've built on 35s and 37s.
Not sure what fits your Gladiator? Call 419-670-3141 or email sales@offroadsource.info for a free fitment check. We also install at our shop in Paulding, Ohio.