What Is 370/60 Tire Size? Complete Specifications and Fitment Guide

What 370/60 Means at a Glance

370/60 describes a tire’s section width and aspect ratio in a metric-like notation, where 370 mm is the section width and 60% is the aspect ratio (height as a percentage of width). Because this marking mixes metric width with a nonstandard format, it is commonly cross-referenced with a corresponding inch-based size, typically 35×6.5R17. This evergreen guide explains the dimensions, conversions, typical applications, and fitment considerations so you can evaluate whether 370/60 matches your vehicle or equipment needs.

Metric Dimensions Breakdown of 370/60

Section Width and Aspect Ratio Explained

In the 370/60 notation, the first number, 370, represents the section width measured in millimeters across the tread from sidewall to sidewall when mounted and inflated to the recommended pressure. The second number, 60, is the aspect ratio, meaning the sidewall height is 60% of the section width. Calculating the sidewall height: 370 mm × 0.60 ≈ 222 mm per side. With two sidewalls, the total tire height is approximately 370 mm + (222 mm × 2), which equals roughly 814 mm or about 32 inches in overall diameter.

Conversions to Standard and Inch-Based Sizing

Inches, Millimeters, and Common Equivalents

Because many vehicle speedometers and gearing calculations rely on inch-based measurements, translating 370/60 into familiar numbers is essential. The table below summarizes key conversions for quick reference and long-term accuracy.

Typical Applications and Vehicle Fitment

Which Machines Use This Size?

A 370/60 profile is uncommon on modern highway cars but appears on certain off-road trucks, all-terrain utility vehicles, and some industrial or agricultural equipment. The relatively tall and narrow sidewall compared to full flotation tires can suit machines that need moderate flotation without extreme mud-terrain height. You will sometimes see it as a regional replacement for 35×6.5R17 on light commercial trucks or heavier SUVs when owners seek a slightly wider footprint for stability on uneven terrain.

Performance Implications

Traction, Speed, and Wear Considerations

• Traction: The 14.6-inch section width provides a broader contact patch than a typical 33-inch all-terrain tire, improving grip on loose gravel and light mud.
• Speedometer Impact: If your vehicle expects a 35-inch tire, using 370/60 (≈32 inches) can cause a slight overestimation of speed, often in the 3–5% range, depending on tire wear and pressure.
• Clearance and Load: Confirm wheel well, brake, and suspension clearance before fitting; taller sidewalls may require adjusted steering stops or drivetrain angles on severely lifted vehicles.
• Wear Profile: A 60 aspect ratio yields a moderately stiff sidewall, balancing comfort and responsiveness, though ride smoothness will also depend on inflation pressure and tread compound.

Fitment and Measurement Best Practices

How to Confirm Compatibility

Accurate fitment begins with measuring your current setup and comparing it to the target tire’s dimensions. Follow these steps to reduce installation issues:

1. Measure the existing tire’s overall diameter at the center of the tread when cold and properly inflated.
2. Check the wheel well for minimum inner clearance, especially when the suspension articulates or the tire turns.
3. Verify brake caliper and spacer clearance with the new tire mounted on the recommended rim width.
4. Confirm that your speedometer calibration can accommodate the rolling circumference difference, or plan for an update if significant.

Comparative Overview: 370/60 vs Common Alternatives

Side-by-Side Utility Snapshot

Buying, Mounting, and Maintenance Tips

Practical Recommendations

Selecting the right set involves more than diameter. Consider your primary terrain, average load, and whether you prioritize fuel efficiency, durability, or comfort. When mounting, use a load- and speed-rated wheel with the correct offset to keep the tire within the wheel well. Maintain manufacturer-specified pressures—lower pressures can improve flotation but increase heat and wear. Rotate tires regularly and inspect for uneven wear, which can signal alignment or suspension issues.

Wrap-Up and Next Steps

Understanding 370/60 in clear dimensional terms helps you compare tires confidently and avoid fitment surprises. For most light trucks and lifted SUVs, this size offers a practical balance of traction, stability, and everyday usability. If you are replacing tires, confirm wheel clearance, load rating, and speedometer calibration before finalizing your choice, and consult a tire professional when in doubt.