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All You Need To Know About P285/70R17 Tire Size

P285/70R17 has a 285 mm section width, a 70% aspect ratio, fits a 17-inch wheel, and has a calculated overall diameter of approximately 32.7 inches with a sidewall approximately 7.9 inches high. The P prefix identifies P285/70R17 as a P-metric passenger-tire size. A verified LT285/70R17 version has the same nominal dimensions, but its LT designation follows different load-capacity and inflation requirements; the two designations are not automatically interchangeable.

P285/70R17 Size Quick Specs

P285/70R17 Dimensions in Inches

The P285/70R17 tire size is approximately 11.2 inches wide, 32.7 inches tall overall, with a sidewall approximately 7.9 inches high. The 17-inch measurement in P285/70R17 identifies the wheel diameter the tire is designed to fit, while the overall diameter represents the approximate complete tire height.

P285/70R17 Tire Size Measurements

• Section Width: Approx. 11.2 inches
• Sidewall Height: Approx. 7.9 inches
• Overall Diameter: Approx. 32.7 inches
• Circumference: Approx. 102.8 inches
• Wheel Diameter: 17 inches

P285/70R17 Alternative Tire Sizes

Drivers comparing P285/70R17 alternatives frequently consider 275/70R17 and P265/70R17. 275/70R17 is narrower and slightly shorter than P285/70R17, and its overall diameter remains within the commonly used ±3% guideline. P265/70R17 is also narrower and shorter, but it falls outside that guideline. The ±3% tire-size guideline is only a starting point: neither comparison establishes interchangeability without checking wheel width, load and inflation requirements, clearance, and vehicle specifications.

P285/70R17 vs 275/70R17

P275/70R17 has an overall diameter approximately 1.69% smaller than P285/70R17, which remains within the commonly used ±3% diameter guideline.

• Width Difference: P275/70R17 is nominally 10 mm narrower than P285/70R17.
• Diameter Difference: P275/70R17 is approximately 0.55 inches smaller in overall diameter than P285/70R17, a difference of 1.69%.
• Interchangeability: The 1.69% diameter difference between P275/70R17 and P285/70R17 falls within the commonly used ±3% guideline, allowing for a swap, but that result alone does not confirm interchangeability. Approved wheel-width compatibility, load capacity, inflation requirements, radial and lateral clearance, and vehicle-specific requirements must still be checked.
• Practical Difference: P275/70R17 reduces nominal width by 10 mm and complete tire height by approximately 0.55 inches compared with P285/70R17.

P285/70R17 vs P265/70R17

P265/70R17 has an overall diameter approximately 3.37% smaller than P285/70R17, which falls outside the commonly used ±3% diameter guideline for passenger vehicles.

• Width Difference: P265/70R17 is nominally 20 mm narrower than P285/70R17.
• Diameter Difference: P265/70R17 is approximately 1.10 inches smaller in overall diameter than P285/70R17, a difference of 3.37%.
• Interchangeability: P265/70R17 falls outside the commonly used ±3% guideline and is generally not recommended as a direct size swap for P285/70R17. The diameter change can affect speedometer accuracy, vehicle clearance, gearing, and systems calibrated around the original tire diameter. 275/70R17 is a closer P-metric size to compare with P285/70R17, with an overall-diameter difference of 1.69%, which remains within the ±3% guideline.
• Practical Difference: P265/70R17 reduces nominal width by 20 mm and complete tire height by approximately 1.10 inches compared with P285/70R17.