P255/75R17 Tire Size

All You Need to Know About P255/75R17 Tires

P255/75R17 is a passenger-rated version of the 255/75R17 size, with the same physical dimensions - about 32.1 inches in overall diameter and 7.53 inches in sidewall height - but different load capacity and inflation characteristics.

This page focuses on how the P-metric designation changes load behavior in the 255/75R17 size. For dimensional analysis, clearance, and size-to-size comparisons, see 255/75R17 tires. For reinforced truck construction, see LT255/75R17 tires.

Unlike LT255/75R17, which is built for higher load and inflation pressure, P255/75R17 operates under passenger-load standards. That means lower typical pressure, greater sidewall compliance, and a ride profile better suited to lighter-duty use.

P255/75R17 Size Quick Specs

• Approved rim width range: 6.5–8.5"
• Best rim width fit: 7.0"–8.0"
• Width: 255 mm
• Sidewall height: 191.25 mm
• Overall diameter: ≈32.1"
• Wheel diameter: 17 in

Note: P255/75R17 has the same calculated dimensions as 255/75R17. Small variations may still occur across manufacturers because tread depth, casing design, and measuring method are not identical from one tire to another.

What P Means in P255/75R17

The “P” in P255/75R17 indicates a passenger load standard, meaning load capacity for this exact size is defined relative to inflation pressure rather than reinforced truck construction.

Although P255/75R17 and 255/75R17 share the same width, sidewall height, and overall diameter, the P-prefix changes how the tire is rated for load and how it is expected to behave under weight.

P255/75R17 Load and Pressure Characteristics

Typical P255/75R17 applications fall in a lower-pressure and lower load-capacity range than LT constructions of the same size. In many cases, maximum load falls around 2,400 to 2,700 lbs per tire, with typical maximum inflation pressure around 44 psi, depending on the exact model and service description.

In practical use, load capacity in P255/75R17 increases with inflation pressure within the tire’s rated limits. If inflation drops below specification, the tire allows more sidewall deflection, which can reduce tread stability, increase heat buildup, and shift how load is distributed across the contact patch.

How the 7.53-Inch Sidewall Affects P255/75R17 Behavior

With a sidewall height of about 7.53 inches, P255/75R17 operates in a range where deflection becomes a major part of how the tire rides and responds. Compared with lower-profile sizes, this taller sidewall absorbs larger road inputs more effectively and improves ride comfort on uneven pavement or light off-road surfaces.

That same flexibility also means inflation pressure matters more. On a tall-profile P-metric tire, underinflation allows more sidewall movement during braking, cornering, and load transfer, which can reduce steering precision and increase tread instability compared with a correctly inflated tire.

P255/75R17 Common Vehicle Applications

P255/75R17 is generally used on SUVs and light-duty trucks where ride comfort, compliant sidewall behavior, and moderate load demand matter more than maximum carrying capacity. Typical applications may overlap with vehicles that also use 255/75R17 or LT255/75R17, but the correct choice depends on how the vehicle is loaded and used.

• Jeep Wrangler and Gladiator (lighter-duty use cases)
• Toyota Tacoma and 4Runner
• Ford Ranger
• Nissan Frontier

Because the P255/75R17 size itself is about 32.1 inches tall, physical fitment still depends on clearance at full steering lock and suspension travel. Construction does not change the size, but it does change how the tire behaves under load.

P255/75R17 vs 255/75R17

P255/75R17 and 255/75R17 share identical external dimensions, but the P-prefix identifies the passenger load standard for this size.

• Overall diameter: identical at ≈32.1"
• Width: identical at 255 mm
• Key difference: load capacity is defined under the passenger standard

Because there is no dimensional difference, substitution is not a size-based decision. The correct checks are load index, inflation pressure requirements, approved rim width range, and whether the tire’s rating matches the vehicle’s actual use.

P255/75R17 vs LT255/75R17

The main difference between P255/75R17 and LT255/75R17 is not size, but construction and load behavior.

• Dimensions: identical
• Pressure range: lower in P-metric form
• Sidewall behavior: more compliant in P-metric form
• Load stability: greater in LT construction under heavier demand

In lighter-duty use, the P-metric version can provide a smoother ride and more compliant road response. In towing, hauling, or repeated high-load service, the LT version is generally the more appropriate reference because its reinforced casing maintains shape more effectively under stress.

When P255/75R17 Is the Better Fit

P255/75R17 is most appropriate when the vehicle is used primarily for daily driving, mixed pavement use, and moderate recreational duty rather than sustained heavy loading.

• Daily-driven SUVs and light trucks
• Drivers prioritizing ride comfort over maximum load capacity
• Applications without regular towing or payload demand near the tire’s limits

Where vehicle use involves heavy cargo, towing, repeated off-road stress, or higher inflation requirements, LT255/75R17 may be the more appropriate construction even though the physical size is unchanged.

Fitment Note for P255/75R17

In P255/75R17 applications, fitment must be evaluated in two separate ways: physical size and load suitability. Physical size is the same as 255/75R17, so clearance checks remain the same. The difference lies in load index, pressure capability, and whether the tire is suitable for the vehicle’s real operating demands.

For size substitutions around this diameter class, it is also useful to review how the 3% rule works in practice and what additional checks matter when changing tire size.