Choosing the Right Fit: 35 vs 37 Tires Comparison

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35 vs 37 tires

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When it comes to off-roading adventures, selecting the right tire size is crucial for optimal performance. One common dilemma that off-road enthusiasts face is choosing between 35-inch and 37-inch tires. While the two-inch difference may not seem significant, it can have a considerable impact on your off-road experiences, particularly if you own a Jeep Gladiator Rubicon fitted with the 3.6L Pentastar engine and eight-speed automatic transmission.

Key Takeaways:

  • Choosing the right tire size is essential for off-road performance and handling.
  • The decision between 35 and 37-inch tires depends on your specific off-road requirements and preferences.
  • Consider factors such as tire size variations, stock wheel compatibility, vehicle weight and power considerations, lifting requirements, fuel economy impact, and spare tire fitment when making your choice.
  • Nitto tires’ Grappler series is known for being true-to-size, making them ideal for accurate tire size comparisons.
  • Before upgrading to a larger tire size, it’s crucial to consider the potential need for aftermarket modifications and the impact on overall vehicle performance.

Size Matters

When it comes to choosing the right tire size, it’s crucial to understand that not all tires are created equal. This is especially true when comparing the popular sizes of 35-inch and 37-inch tires. While the two-inch difference may not seem significant at first glance, it can have a considerable impact on the performance of the Jeep Gladiator.

Different tire manufacturers may have variations in the actual height of a tire labeled as 35 or 37 inches. However, one brand that stands out for its true-to-size measurements is Nitto. Nitto’s Grappler series is known for providing accurate tire sizes. When comparing tire sizes, it’s important to consider the true measurements rather than relying solely on the labeled size.

While the size difference may not have a significant impact on the performance of a 35-inch tire, it becomes more pronounced when moving up to a 37-inch tire. On the Gladiator platform, this size difference can affect various aspects of the vehicle’s capabilities, including its off-road performance.

Stock Wheels and No Lift

For Jeep Gladiator owners looking to enhance their off-road experience without a lift kit, choosing the right tire size is crucial. If you plan to run a 35-inch tire on the stock 17-inch Rubicon wheel, it’s best to opt for a 35×11.50 tire. This tire width allows you to stay within the recommended specifications for the stock 7.5-inch wheel width.

stock wheels

Testing has shown that running a 35×11.50R17 Nitto Trail Grappler on the Gladiator platform with no lift is not only possible but also comes with no issues. However, it’s important to note that you should avoid running a 12.50-inch-wide tire to ensure compliance with the tire manufacturer’s recommendations. This is especially relevant for the Rubicon and Mojave models.

If you’re looking to upgrade your wheels, aftermarket wheel options are available to further enhance your off-road capabilities. Choosing the right wheel with the appropriate offset and backspacing is crucial for a successful fitment. Be sure to consult with experts or refer to manufacturer specifications to ensure compatibility with your vehicle and tire size.

Weight and Power Considerations

When it comes to optimizing your Jeep Gladiator’s performance, considering the weight and power impact of different tire options is crucial. The weight of a tire affects the vehicle’s overall un-sprung mass, influencing its handling, stability, and fuel economy. Additionally, tire weight can have a significant impact on power delivery and gear ratios, especially when upgrading to larger sizes.

The difference in weight between a 35-inch tire and a 37-inch tire may seem minimal, but it can make a noticeable difference in performance. For example, the stock 285 Load Range C mud-terrain tires that come standard on the Jeep Gladiator Rubicon weigh around 50 pounds (without the wheel). However, a larger 37×12.50R17 Load Range D Nitto Trail Grappler tire weighs approximately 35 pounds more at 85 pounds. This increase in un-sprung mass can affect acceleration, braking, and overall handling characteristics.

Power and fuel economy can also be impacted when upgrading to larger tires. The Rubicon and Max Tow Gladiators equipped with 4.10 differential gears can handle a 35-inch tire without a significant effect on power delivery and fuel efficiency. However, when upgrading to a 37-inch tire, the vehicle may not utilize overdrive gears as easily or as often, which can impact power and cause a decrease in fuel economy.

To address these power and fuel economy considerations, aftermarket differential gears with recommended ratios of 4.88 or 5.13 are recommended for optimal performance with a 37-inch tire. These differential gear upgrades help restore power delivery and compensate for the increased tire size, allowing the vehicle to perform at its best.

Considering the weight and power impact of tire size changes is essential when making modifications to your Jeep Gladiator. By selecting the right tire weight and gear ratios, you can ensure optimal performance, power delivery, and fuel efficiency for your off-road adventures.

Weight and Power Considerations: Comparison

Tire Size Tire Weight (without wheel)
35-inch 50 pounds
37-inch 85 pounds

Low Lift & 37s

If you’re determined to run 37-inch tires on your Rubicon without a tall lift, there’s good news! All you need is a 1-inch front spacer and bump stop to accommodate the larger tires. This affordable solution allows you to achieve the desired tire size without making significant modifications to your vehicle’s suspension.

However, it’s important to note that there may be some rubbing issues off-road. The Rubicon’s massive wheelwells provide ample space for the 37-inch tires, but choosing the right backspacing for your aftermarket wheel setup is critical. By selecting a wheel with proper backspacing, you can ensure that your tires fit without any rubbing concerns, even during rugged off-road adventures.

To validate the fitment and performance of running 37-inch tires with a low lift, we recommend conducting a full trail test. By putting your setup to the test on various terrains and challenging obstacles, you’ll gain valuable insights into how well your Rubicon handles with the larger tires. This firsthand experience will give you a clear understanding of the capabilities and limitations of your low lift and 37-inch tire combination.

Running 37-inch tires without a tall lift is an exciting option for Jeep enthusiasts who desire improved ground clearance and enhanced off-road capabilities. With the right modifications and careful consideration of backspacing, this setup can provide an affordable and practical way to achieve your off-road goals.

Fuel Economy Considerations

The stock Jeep Gladiator is not known for its fuel efficiency, and adding heavier and taller tires will only further decrease its fuel economy. When upgrading from a 35-inch to a 37-inch tire with stock 4.10 gears, there is a noticeable impact on average daily economy. The average daily economy drops from 16.5 to 15, which may not make a significant difference for short commutes.

However, individuals with longer highway commutes at speeds over 65mph may experience a more substantial decrease in fuel economy. It’s important to consider that each vehicle’s fuel economy can differ based on individual modifications and driving conditions.

To mitigate the impact of larger tires on fuel economy, aftermarket differential gearing can be a viable solution. Swapping to a 4.88 differential gear ratio brings the fuel economy back to the level observed with a 35-inch tire. This modification allows optimal fuel efficiency even with the larger 37-inch tire.

It’s important to note that the overall fuel economy of the Jeep Gladiator is influenced by various factors, including weight, tire size, gear ratio, and driving habits. Individuals should carefully consider their specific needs and priorities when making modifications that may affect fuel economy.

Impact of Heavier and Taller Tires

Adding heavier and taller tires to the stock Jeep Gladiator results in decreased fuel economy. Upgrading from a 35-inch to a 37-inch tire leads to a drop in average daily economy, which may be more noticeable during longer highway commutes.

Stock 4.10 Gears

The stock 4.10 gears that come with the Jeep Gladiator can handle a 35-inch tire without a significant effect on fuel economy. However, upgrading to a 37-inch tire may necessitate aftermarket differential gearing to maintain optimal fuel efficiency.

Overall Fuel Economy

Individual modifications and driving conditions play a significant role in the overall fuel economy of the Jeep Gladiator. To maintain satisfactory fuel efficiency, it’s important to consider factors such as weight, tire size, gear ratio, and driving habits.

Spare Tire Considerations

When it comes to the spare tire, it’s crucial to consider the available space and whether the tire will fit in the stock spare tire location. With approximately 36.5 inches of clearance under the bed of the Gladiator, any 35-inch tire will fit without any issues. However, fitting a true-to-size 37-inch tire in the stock spare tire location can be more challenging. Aftermarket track bars and suspension modifications may be necessary to accommodate the larger tire. If an easy solution is preferred, the 35-inch tire is the better fit for the stock spare tire location.

true-to-size tire

“The spare tire is a crucial consideration, especially when venturing off-road. It’s essential to ensure that the spare tire fits properly and doesn’t interfere with other components of the vehicle. With the Gladiator’s generous under bed clearance of approximately 36.5 inches, there is ample room for a true-to-size 35-inch tire. This means that you can confidently equip your spare tire with a 35-inch tire that matches the diameter of your other tires. However, if you’re determined to run a 37-inch tire on your Gladiator, it’s important to note that it may require aftermarket modifications such as track bars and suspension enhancements to fit in the stock spare tire location.”

Choosing the right spare tire size ensures that you have a reliable backup in case of emergencies. With the true-to-size fitment of a 35-inch tire in the stock spare tire location, you can rest assured that it will be easily accessible and compatible with your other tires. This convenient fitment eliminates the need for any additional modifications, providing peace of mind during your off-road adventures.

“The spare tire plays a crucial role in off-road situations where a flat tire can easily ruin the day. If you’re running a 35-inch tire on your Gladiator, you’ll be pleased to know that it can be easily accommodated in the stock spare tire location. This means that you won’t have to worry about any aftermarket modifications or complex installations. However, if you’re eyeing a larger 37-inch tire, keep in mind that it might require additional modifications to ensure a proper fit. It’s recommended to consult with a knowledgeable mechanic or experienced off-road enthusiast to determine the best approach for your specific tire size.”

Considering the true-to-size fitment and straightforward installation, opting for a 35-inch tire as your spare tire provides ease, accessibility, and compatibility. It eliminates the need for aftermarket modifications and ensures that you have a reliable backup in case of emergencies.

Conclusion

Choosing the right tire size for your Gladiator is a decision that should be based on your specific off-road needs and preferences. In terms of practicality and ease of fitment, the Rubicon and Mojave Gladiators do not require a lift for a 35-inch tire. The stock 4.10 gears are sufficient, and the spare tire location can accommodate a 35-inch tire without any issue.

However, if your off-road adventures involve more challenging terrains and you prioritize increased ground clearance and traction, a 37-inch tire may be a better choice. It’s important to note that running a 37-inch tire requires a larger investment, as it entails considerations for lift, gear ratio, and potential modifications.

When making your decision, it’s crucial to consider the impact on fuel efficiency, overall vehicle performance, and the need for additional modifications. While a 37-inch tire can provide enhanced off-road performance, it may lead to a decrease in fuel economy. Ultimately, the choice between a 35 or 37-inch tire should align with your specific off-road requirements and preferences.

FAQ

Are 35 and 37-inch tires created equal in size?

Not all tires labeled as 35 or 37 inches are the same size. Nitto Grappler series tires are known for being true-to-size and provide accurate comparisons.

Can I run a 35-inch tire on the stock 17-inch Rubicon wheel without any lift?

Yes, you can run a 35×11.50R17 Nitto Trail Grappler tire on the Gladiator platform without any lift. However, it’s important to choose a slightly narrower width, such as 11.50 inches, to stay within the tire manufacturer’s recommendations.

What is the weight difference between a 35 and 37-inch tire?

The weight difference is approximately five pounds. While this may not seem significant, it can impact the vehicle’s overall un-sprung mass and performance.

Can the Jeep Gladiator handle a 37-inch tire without a lift?

Yes, to accommodate a 37-inch tire on the Rubicon platform, all that is needed is a 1-inch front spacer and bump stop. However, there may be some rubbing issues off-road, and choosing the right backspacing for the aftermarket wheel setup is crucial.

How does upgrading to a 37-inch tire impact fuel economy?

Upgrading from a 35-inch to a 37-inch tire with stock 4.10 gears may result in a decrease in fuel economy. However, swapping to a 4.88 differential gear ratio can bring the fuel economy back to the level observed with a 35-inch tire.

Can a 37-inch tire fit in the stock spare tire location?

Fitting a true-to-size 37-inch tire in the stock spare tire location can be more challenging and may require aftermarket track bars and suspension modifications. Opting for a 35-inch tire is a better fit for the stock spare tire location.

Which tire size should I choose for my Gladiator?

The decision of whether to choose a 35 or 37-inch tire for your Gladiator depends on your intended use and preferences. Consider practicality, ease of fitment, off-road performance, fuel efficiency, and overall vehicle use.

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