P255/60R17 Tire Size

All You Need to Know About P255/60R17 Tires

P255/60R17 carries the passenger (P) load designation, which means load capacity for this size is calculated under passenger-use standards rather than light-truck or commercial construction requirements. The external dimensions of P255/60R17 size are identical to 255/60R17 - the P-prefix defines the load methodology, not the physical size.

At ≈29.1 inches in diameter with a 6.02-inch sidewall, the P255/60R17 is a profile where inflation discipline matters more than it might appear. A sidewall this deep can absorb gradual pressure loss without an obvious change in how the tire looks or feels, while the effects on load distribution and sidewall flex build quietly underneath.

P255/60R17 Size Quick Specs

• Total heigth: ≈29.1"
• Width: 255 mm
• Sidewall height: 6.02"
• Rim width range: 7.0–9.0"
• Optimal rim width: 7.5"

What P Means in P255/60R17

The “P” in P255/60R17 designates a P-metric passenger tire built to U.S. load-rating standards. While its external dimensions match a 255/60R17 tire without the prefix, the two follow different load-rating systems: P-metric versus Euro-metric (ISO) passenger standards.

At the ≈29.1" overall diameter and 255 mm width of 255/60R17, this size is commonly fitted to midsize SUVs where axle loads are relatively high for a passenger tire. In this context, the difference between P255/60R17 and a non-P 255/60R17 is not dimensional but methodological: P-metric load ratings are reduced when used on SUV/light-truck applications, while Euro-metric ratings are not. As a result, two tires of identical size can carry different effective loads in real use, depending on the standard under which they are rated.

P255/60R17 Load Capacity and Pressure Behavior

In P255/60R17, load capacity is pressure-dependent within the tire's rated limits, but the more relevant point is what happens when pressure falls short of specification. Increased sidewall flex accelerates heat buildup, and on a 6-inch sidewall, that process develops more gradually and less visibly than on a lower-profile size. By the time handling or wear patterns signal a problem, the structural stress has typically been accumulating for some time.

The same sidewall depth that makes P255/60R17 effective at absorbing road irregularities also makes it more sensitive to pressure deviation than a 45- or 50-series tire of comparable width. A shorter sidewall has less material to flex, and therefore less margin for pressure loss before the effect becomes noticeable. On the 60-series profile, the compliance that improves ride quality is the same mechanism that masks underinflation, which is why maintaining correct pressure on P255/60R17 size matters more than it might appear under normal driving conditions.

P255/60R17 Common Vehicle Applications

P255/60R17 is used on SUVs and passenger-oriented utility vehicles where ride comfort and stability are prioritized.

• Jeep Grand Cherokee
• Honda Pilot
• Chevrolet TrailBlazer
• GMC Envoy
• Mercedes-Benz M-Class
• Dodge Dakota (1991-2004)
• Oldsmobile Bravada (2002-2004)
• Cadillac SRX
• Jeep Liberty (2005-2006, 2008-2013)

P255/60R17 vs 255/60R17

• Dimensions: identical (≈29.1")
• Width: identical (255 mm)
• Difference: passenger load standard (pressure-based)

Because there is no size difference between P255/60R17 and 255/60R17, substitution is not based on fitment. Instead, verification must focus on load index, inflation pressure, and compatibility with vehicle requirements.

Comparison of P255/60R17 With Similar P-Metric Sizes

P255/60R17 is most frequently cross-referenced against P255/50R17 - same width, substantially different diameter - and P265/60R17, which adds width while staying close to overall height. One pairing is well outside substitution range; the other is among the cleaner swaps at this profile level.

P255/60R17 vs P255/50R17

• Width: identical at 255 mm
• Overall diameter: P255/60R17 is ≈2.01 inches (≈7.4%) larger than P255/50R17

At 7.4%, the diameter gap between P255/60R17 and P255/50R17 is almost two and a half times the ±3% limit. These sizes share a width designation but occupy different diameter classes entirely, with meaningful consequences for ride height, rotational frequency, speedometer accuracy, and effective gearing. No substitution case applies here.

P255/60R17 vs P265/60R17

• Width: P265/60R17 is 10 mm wider
• Overall diameter: P265/60R17 is ≈0.47 inches (≈1.6%) larger than P255/60R17

The diameter gap between P265/60R17 and P255/60R17 sits comfortably within the ±3% range, leaving drivetrain calibration and speedometer reading largely unaffected. The practical consideration is that the added section width of 10 mm increases the contact patch and reduces available clearance at inner suspension components and the outer fender edge, particularly under load compression, where the sidewall expands outward. Rim width compatibility should also be confirmed, as the wider tire may fall outside the approved range for the existing wheel.

 P255/60R17 Fitment Note

On P255/60R17, diameter compatibility is the starting point - not the conclusion. Load index, inflation pressure requirements, and approved rim width all require independent verification before installation, particularly on the heavier crossover and SUV platforms where this size most commonly appears.