P245/50R17 Tire Size

All You Need to Know About P245/50R17 Tires

P245/50R17 tires use the passenger load standard, which means load capacity for this exact size is defined relative to inflation pressure rather than by size alone. Although P245/50R17 shares the same external dimensions as 245/50R17, the P-prefix identifies how the tire is rated for passenger-vehicle service.

With a width of 245 mm, a 50% aspect ratio, and a 17-inch wheel diameter, P245/50R17 produces an overall diameter of 26.6 inches and a sidewall height of 4.8 inches. These measurements define its physical size, while inflation pressure and load index determine how the tire behaves under passenger-vehicle load conditions.

Compared with the standard 245/50R17 designation, P245/50R17 places the focus on passenger-rated load behavior for this size. That distinction matters when matching tire specifications to vehicle requirements, because the size stays the same while the rating language becomes more specific.

P245/50R17 Size Quick Specs

• Approved rim width range: 7.0-8.5"
• Ideal Rim Width: 7.5 " or 8.0 "
• Width: 245 mm
• Sidewall height: 122.50 mm
• Total diameter: ≈26.6"
• Wheel diameter: 17 in

Note: P245/50R17 has the same calculated dimensions as 245/50R17. Minor mounted-diameter variation may still appear across manufacturers because tread depth and casing design are not identical from one tire to another.

What P Means in P245/50R17

The “P” in P245/50R17 indicates that this 245/50R17 size is identified under a passenger load standard. In practical terms, load capacity depends on inflation pressure for this size, even though it keeps the same 26.6-inch diameter and 4.8-inch sidewall height as 245/50R17.

That makes P245/50R17 most relevant on passenger sedans and comfort-oriented highway applications where ride stability, predictable handling, and correct load index matter more than any change in dimensions.

P245/50R17 Load Capacity and Pressure Behavior

In P245/50R17, load capacity is directly tied to inflation pressure within the tire’s specified limits. When pressure drops below the PSI recommended level, the tire loses structural stability, leading to increased sidewall deflection, uneven load distribution, and higher heat buildup.

With its 50-series sidewall, P245/50R17 shows more visible response to pressure variation than lower-profile sizes. The taller sidewall improves impact absorption and ride comfort, but it also requires proper inflation to maintain tread stability and consistent handling under load.

P245/50R17 Common Vehicle Applications

P245/50R17 is used on passenger sedans and highway-oriented vehicles where ride comfort and straight-line stability are prioritized. Typical applications include:

• BMW 5 Series, 3 Series
• Audi: A6, A4
• Acura: RL (2005-2008), TL (2009-2014)
• Dodge Charge

In these applications, P245/50R17 reflects a passenger load standard for this size, where fitment still depends on wheel width, offset, and clearance, but load behavior is managed through pressure and rating specifications rather than through any dimensional difference from 245/50R17.

P245/50R17 Dimensions in Inches

P245/50R17 is approximately 9.7 inches wide, 26.6 inches tall overall, and has a sidewall height of 4.8 inches.

That 4.8-inch sidewall gives P245/50R17 a comfort-oriented profile. It provides more vertical compliance than lower-profile alternatives, which improves ride isolation, while still maintaining enough lateral support for stable highway handling in typical passenger-car use.

P245/50R17 in Inches: All Measurements

• Total diameter: 2≈26.6"
• Width: ≈9.7"
• Sidewall height: ≈4.8"
• Wheel diameter: 17"
• Circumference: ≈83.7"

P245/50R17 vs 245/50R17 Tires

P245/50R17 and 245/50R17 have identical physical dimensions, but the P-prefix designates the passenger load standard for this size.

• Overall diameter: ≈26.6" (same)
• Width: 245 mm (same)
• Key difference: load capacity is defined under the P-metric system

Because there is no dimensional difference between P245/50R17 and 245/50R17, substitution is not a size-based decision. The correct evaluation focuses on load index, inflation pressure requirements, approved rim width range, and whether the tire’s rating aligns with the vehicle’s specifications.

Comparison of P245/50R17 With Similar P-Metric Sizes

Within passenger touring sizing, P245/50R17 aligns with wide-section configurations that prioritize ride quality and highway stability. The closest comparisons include P245/45R17 as the lower-profile alternative and P255/50R17 as a wider size that stays close in overall diameter.

Difference Between P245/50R17 and P245/45R17

The P245/45R17 is shorter while maintaining the same width:

• Width: identical at 245 mm
• Overall diameter: P245/45R17 is ≈0.98 inches (≈3.7%) smaller than P245/50R17

Because this reduction exceeds the ±3% threshold, P245/50R17 and P245/45R17 are not directly interchangeable. The shorter sidewall lowers ride height and increases wheel rotation frequency, which affects speedometer accuracy and changes ride and handling balance.

Difference Between P245/50R17 and P255/50R17

The P255/50R17 is wider and slightly taller:

• Width: P255/50R17 is 10 mm wider than P245/50R17
• Overall diameter: P255/50R17 is ≈0.39 inches (≈1.5%) larger than P245/50R17

Since the diameter difference remains within the ±3% range, P255/50R17 and P245/50R17 sizes are generally compatible from a rolling-diameter standpoint. The practical change comes from the added section width, which affects rim-width compatibility, inner clearance, and outer fender space.

Fitment Note for P245/50R17

In P245/50R17 applications, the ±3% diameter rule is only one part of the evaluation. Proper substitution also requires checking load index, inflation pressure requirements, approved rim width, and available clearance before installation.