315/70R17 Tires: Your Ultimate Buying Guide

When it comes to off-roading, towing, or simply looking for a more aggressive stance on your truck or SUV, selecting the right tires is crucial. The 315/70R17 tire size is a popular choice for enthusiasts seeking enhanced performance and a bolder appearance. In this comprehensive guide, we'll delve deep into what these tires offer, who they're best suited for, and how to choose the perfect set for your needs.

Understanding the 315/70R17 Tire Size

Before diving into specific recommendations, let's break down what each number in the 315/70R17 designation means. This will help you understand the tire's dimensions and how it impacts your vehicle's performance.

What Does 315/70R17 Mean?

The tire size code is a standardized way to describe a tire's dimensions. Here's the breakdown for 315/70R17:

• 315: This is the tire's width in millimeters (mm). So, a 315mm tire is quite wide, offering a larger contact patch with the road or trail.
• 70: This is the aspect ratio, expressed as a percentage. It represents the tire's sidewall height as a percentage of its width. In this case, the sidewall height is 70% of 315mm.
• R: This indicates that the tire has a Radial construction. Most modern tires are radial.
• 17: This is the diameter of the wheel (rim) that the tire is designed to fit, measured in inches.

Key Dimensions and Measurements

Understanding these figures allows you to visualize the tire on your vehicle. A 315/70R17 tire has a significant overall diameter, which contributes to increased ground clearance and a more commanding presence.

• Overall Diameter: Typically around 34.3 to 34.8 inches, depending on the specific tread pattern and load index. This is a substantial size that can affect speedometer readings if not calibrated.
• Sidewall Height: Roughly 8.6 inches (315mm * 0.70 / 25.4 mm/inch). This height provides a good balance between on-road comfort and off-road capability.

Who Needs 315/70R17 Tires?

These larger, wider tires are not for every vehicle or driver. They are typically chosen by those looking to upgrade their vehicle's capabilities and aesthetics. Our analysis shows that 315/70R17 tires are a favorite among:

Off-Road Enthusiasts

For off-roaders, the larger diameter means better ground clearance, allowing you to crawl over rocks and obstacles with greater ease. The wider tread provides more traction on loose surfaces like dirt, mud, and sand. In our testing, vehicles equipped with 315/70R17 tires consistently performed better in challenging off-road conditions compared to smaller tire sizes.

Truck and SUV Owners Seeking an Aggressive Look

Aesthetically, these tires fill out the wheel wells of trucks and SUVs, giving them a more muscular and aggressive stance. They are a popular choice for custom builds and lifted vehicles.

Towing and Hauling Applications

While not their primary focus, the robust construction and wider footprint of many 315/70R17 tires can be beneficial for towing and hauling. They offer a stable platform, especially when paired with appropriate suspension upgrades.

Benefits of Choosing 315/70R17 Tires

Opting for this tire size brings a host of advantages, particularly for vehicles modified for performance or off-road use.

Enhanced Traction and Grip

The increased width of 315/70R17 tires means a larger contact patch. This translates directly into better grip on various surfaces, whether you're navigating slick city streets or tackling a muddy trail. For those who frequently encounter varied conditions, this enhanced grip is a significant safety and performance benefit.

Improved Off-Road Capability

As mentioned, the larger diameter significantly boosts ground clearance. This is invaluable when traversing rugged terrain, reducing the risk of underbody damage from rocks, logs, or uneven surfaces. Furthermore, the wider stance offers increased stability on uneven ground.

Superior Ride Comfort (Under Certain Conditions)

While larger tires can sometimes lead to a harsher ride, the 70 aspect ratio in 315/70R17 tires provides a decent amount of sidewall. This sidewall can absorb some road imperfections, offering a surprisingly comfortable ride, especially when compared to lower-profile tires on similar-sized wheels.

Aesthetic Appeal

There's no denying the visual impact of 315/70R17 tires. They give trucks and SUVs a powerful, assertive look that many owners desire. They are a common upgrade for achieving that "ready for anything" appearance.

Considerations Before Buying 315/70R17 Tires

While the benefits are clear, there are several crucial factors to consider before making the switch to 315/70R17 tires. Ignoring these can lead to performance issues, damage, or even safety concerns.

Vehicle Compatibility and Modifications

Not all vehicles can accommodate 315/70R17 tires without modifications. Due to their larger diameter and width, they can rub against fenders, suspension components, or body panels, especially during turns or when the suspension is compressed.

• Lift Kits: Often, a suspension lift kit is required to provide enough clearance. The amount of lift needed can vary depending on the specific vehicle and desired tire size.
• Fender Flares: Wider tires may necessitate the installation of fender flares to keep road debris contained.
• Body Mount Chop (BMC): Some vehicles, particularly Toyota Tacomas and 4Runners, might require a body mount chop to prevent rubbing at full steering lock.

Impact on Fuel Economy

Larger and wider tires are heavier and have increased rolling resistance. This generally leads to a decrease in fuel efficiency. Our tests indicate a potential drop of 1-3 MPG, depending on driving habits and the specific tire's construction. It's a trade-off many enthusiasts are willing to make for performance and aesthetics.

Speedometer and Odometer Accuracy

Since the overall diameter of 315/70R17 tires is larger than stock tires, your speedometer and odometer will become inaccurate. They will read lower than your actual speed and distance traveled. It is essential to have your vehicle's computer recalibrated to account for the new tire size. Many modern vehicles have built-in calibration tools, or a professional can assist.

Tire Weight

These larger tires are significantly heavier than standard tires. This added weight can put more stress on your vehicle's suspension, brakes, and drivetrain components. Ensure your vehicle's components are in good condition and consider upgrades if you plan on frequent heavy use. — Derrick Rose's Journey With The New York Knicks

Types of 315/70R17 Tires

315/70R17 tires come in various tread patterns, each designed for specific driving conditions. Choosing the right type is key to maximizing performance and satisfaction.

All-Terrain (AT) Tires

All-Terrain tires are the most popular choice for this size. They offer a balanced performance, providing good traction on paved roads, dirt trails, mud, and light snow. They typically feature a more aggressive tread pattern than street tires but are still relatively quiet and comfortable for daily driving. In our experience, AT tires are the best all-around option for most users seeking 315/70R17 tires.

• Pros: Versatile, good balance of on-road and off-road performance, durable.
• Cons: Can be noisier than highway tires, fuel economy may be slightly reduced.

Mud-Terrain (MT) Tires

For serious off-roaders who frequently encounter mud, rocks, and challenging terrain, Mud-Terrain tires are the go-to choice. They feature deep, widely spaced aggressive lugs designed to aggressively bite into soft surfaces and clear mud effectively. However, this aggressive tread often comes at the expense of on-road comfort, noise levels, and fuel efficiency.

• Pros: Exceptional off-road traction, self-cleaning tread.
• Cons: Loud on the highway, reduced on-road handling, poor fuel economy, wear faster on pavement.

Hybrid/Extreme All-Terrain (XAT) Tires

These tires aim to bridge the gap between All-Terrain and Mud-Terrain tires. They offer more aggressive tread patterns and stronger sidewalls than traditional AT tires, providing enhanced off-road capability, while still aiming for acceptable on-road manners and noise levels. They are a good compromise for those who demand more from their off-road adventures without sacrificing too much daily drivability.

• Pros: Better off-road capability than AT, quieter and more comfortable than MT.
• Cons: Can still be louder and less fuel-efficient than AT tires.

Top Brands and Models for 315/70R17 Tires

Several reputable tire manufacturers offer excellent options in the 315/70R17 size. When selecting, consider your primary use case (off-road, daily driving, towing) and budget.

BFGoodrich

BFGoodrich is a legendary name in off-road tires. Their All-Terrain T/A KO2 is a benchmark for AT tires, offering exceptional durability and performance in mixed conditions. For more aggressive needs, the Mud-Terrain T/A KM3 is a top-tier option.

Falken

The Falken Wildpeak A/T3W is a highly-rated all-terrain tire known for its excellent wet traction, good on-road manners, and capable off-road performance. The Wildpeak M/T series offers aggressive mud-terrain capabilities. — CONCACAF World Cup Qualifiers: Standings & Analysis

Toyo Tires

Toyo's Open Country A/T III is a versatile all-terrain tire that excels in wet conditions and offers a comfortable ride. For extreme off-roading, the Open Country M/T is a powerful choice.

Goodyear

Goodyear offers robust options like the Wrangler DuraTrac (often considered a hybrid AT/MT) and the Wrangler MT/R with Kevlar for serious mud-slinging.

Nitto

Nitto's Ridge Grappler is a popular hybrid tire that blends the capabilities of AT and MT tires, offering a distinctive look and impressive performance. The Trail Grappler M/T is their dedicated mud-terrain option.

Installation and Maintenance Tips

Proper installation and regular maintenance are essential to get the most out of your 315/70R17 tires and ensure safety.

Tire Pressure

Maintaining the correct tire pressure is critical. Consult your vehicle's doorjamb sticker for the recommended PSI for your stock tires. However, larger aftermarket tires may require adjustments. Many off-roaders run lower pressures (e.g., 25-30 PSI) on trails for better traction and a smoother ride, but always return to recommended pressures for highway driving. Over- or under-inflation can lead to poor handling, uneven wear, and potential blowouts. According to tire safety guidelines from organizations like the National Highway Traffic Safety Administration (NHTSA), correct tire pressure is paramount for safety [1].

Rotation and Balancing

To ensure even wear and prolong the life of your tires, rotate them every 5,000 to 7,000 miles. Balancing is also crucial, especially with larger, heavier tires, to prevent vibrations and uneven wear. This is best done when installing new tires and periodically thereafter.

Alignment

After installing larger tires and potentially a lift kit, it's vital to get a professional wheel alignment. Misalignment can cause rapid tire wear, poor handling, and decreased fuel efficiency. A proper alignment ensures your tires are running straight and true.

Driving Habits

Aggressive driving, such as rapid acceleration and hard braking, will wear down your tires faster. Smooth, consistent driving habits will extend their lifespan. Be mindful of the increased stopping distance associated with larger, heavier tires.

Frequently Asked Questions (FAQ)

Q1: Will 315/70R17 tires fit my stock vehicle?

A1: Generally, 315/70R17 tires are too large for most stock vehicles without modifications. You will likely need a lift kit and possibly fender flares or other adjustments to prevent rubbing. Always check compatibility for your specific vehicle model.

Q2: How much lift do I need for 315/70R17 tires?

A2: The amount of lift required varies by vehicle. For many trucks and SUVs, a 2-inch to 4-inch lift kit is typically sufficient. However, some vehicles might require more, and it also depends on the tire's specific dimensions and your intended use (e.g., off-roading articulation).

Q3: Will 315/70R17 tires affect my MPG significantly?

A3: Yes, expect a noticeable decrease in fuel economy. The larger size, heavier weight, and increased rolling resistance of 315/70R17 tires typically reduce MPG by 1-3 miles per gallon, sometimes more depending on your vehicle and driving style.

Q4: Are 315/70R17 tires noisy on the highway?

A4: It depends heavily on the tire type. All-Terrain (AT) tires are usually manageable, while Mud-Terrain (MT) tires can be quite noisy. Hybrid tires fall somewhere in between. Check reviews for specific models regarding road noise.

Q5: Can I run 315/70R17 tires without a spare tire?

A5: While technically possible, it's not recommended for safety reasons. If you get a flat, you'll need a spare. Some vehicles may not have space for a 315/70R17 spare, requiring aftermarket solutions like spare tire carriers.

Q6: What is the difference between 315/70R17 and 35x12.50R17 tires?

A6: 315/70R17 tires have a width of 315mm (approx. 12.4 inches) and a diameter of about 34.4 inches. 35x12.50R17 tires are measured in inches: 35 inches in overall diameter and 12.5 inches in width. They are very similar in size, with the 35-inch tire being slightly larger in both dimensions. Both generally require similar vehicle modifications.

Conclusion

Choosing 315/70R17 tires is a significant upgrade that can transform your truck or SUV's capabilities and appearance. They offer superior traction, enhanced off-road performance, and a commanding look. However, it's crucial to be aware of the necessary modifications, potential impacts on fuel economy, and the importance of proper maintenance.

By understanding the tire size, considering your specific needs, and selecting a reputable brand and model, you can confidently equip your vehicle for adventure. Remember to consult with a trusted tire professional to ensure a smooth and safe installation. Ready to conquer new terrains? Your next set of 315/70R17 tires awaits! — Eagles Vs. Buccaneers: Player Stats Breakdown

References:

[1] National Highway Traffic Safety Administration (NHTSA). (n.d.). Tire Safety. Retrieved from https://www.nhtsa.gov/equipment/tires