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All You Need To Know About P245/65R17 Tire Size

P245/65R17 has a 245 mm section width, a 65% aspect ratio, fits a 17-inch wheel, has a calculated overall diameter of approximately 29.5 inches, and has a sidewall approximately 6.3 inches high. The P prefix identifies P245/65R17 as a P-metric passenger tire size. A verified 245/65R17 version also exists with the same nominal dimensions; P245/65R17 and the non-P designation are separately listed tire designations, so matching numerical dimensions alone should not be treated as proof that the two designations are interchangeable.

P245/65R17 Size Quick Specs

What Vehicles Use P245/65R17?

P245/65R17 is documented as a factory/OE tire size for specific Chevrolet TrailBlazer, GMC Envoy, and Buick Rainier applications.

• Chevrolet TrailBlazer
• GMC Envoy
• Buick Rainier

To check whether the P245/65R17 tire size is a factory fitment for your specific vehicle, use our VIN lookup tool.

Dimensions in Inches for P245/65R17

The P245/65R17 tire size is approximately 9.6 inches wide, 29.5 inches tall overall, with a sidewall approximately 6.3 inches high. For P245/65R17, the 17-inch figure means the tire is designed for a 17-inch wheel, while the overall diameter shows approximately how tall the complete tire is.

P245/65R17 in Inches: All Measurements

• Overall Diameter: Approx. 29.5 inches
• Sidewall Height: Approx. 6.3 inches
• Section Width: Approx. 9.6 inches
• Rim Diameter: 17 inches
• Circumference: Approx. 92.8 inches

P245/65R17 Alternative Tire Sizes

Drivers researching alternatives to P245/65R17 also compare P235/70R17 and P245/70R17. P235/70R17 is narrower but slightly taller overall, and its diameter remains relatively close to P245/65R17. P245/70R17 keeps the same nominal width but uses a taller sidewall, pushing its overall diameter outside the commonly used ±3% guideline. Neither comparison alone confirms interchangeability. The ±3% tire-size guideline is only a starting point; wheel width, load capacity, clearance, and vehicle requirements still matter.

P245/65R17 vs P235/70R17

P235/70R17 is approximately 1.40% larger in overall diameter than P245/65R17, so the diameter difference is within the commonly used ±3% guideline, allowing for a direct swap.

• Width Difference: P235/70R17 is 10 mm narrower than P245/65R17.
• Diameter Difference: P235/70R17 is approximately 0.4 inches taller overall than P245/65R17, a 1.40% increase.
• Interchangeability: The P235/70R17 diameter difference is within the commonly used ±3% guideline, but this alone does not confirm interchangeability with P245/65R17. Wheel width, load capacity, clearance, and vehicle requirements must still be checked.
• Practical Difference: P235/70R17 is narrower than P245/65R17 but uses a taller 70-series sidewall, resulting in a slightly larger overall diameter.

P245/65R17 vs P245/70R17

P245/70R17 is approximately 3.27% larger in overall diameter than P245/65R17, so the diameter difference falls outside the commonly used ±3% guideline, meaning that the swap between the two sizes is risky due to poor fitment.

• Width Difference: P245/70R17 and P245/65R17 have the same nominal 245 mm section width.
• Diameter Difference: P245/70R17 is approximately 1.0 inch taller overall than P245/65R17, a 3.27% increase.
• Interchangeability: P245/70R17 falls outside the commonly used ±3% guideline and is generally not recommended as a direct size swap for P245/65R17. The larger diameter change can affect speedometer accuracy, vehicle clearance, and vehicle systems calibrated around the original tire diameter.
• Practical Difference: P245/70R17 keeps the same nominal width as P245/65R17 but increases the aspect ratio from 65% to 70%, producing a taller sidewall and larger overall tire diameter.