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All You Need To Know About P245/45R17 Tire Size

P245/45R17 has a 245 mm section width, a 45% aspect ratio, fits a 17-inch wheel, and has a calculated overall diameter of approximately 25.7 inches with a sidewall approximately 4.3 inches high. P245/45R17 uses the P-metric passenger designation. A 245/45R17 version with the same nominal dimensions is also available; the P-metric and non-P designations should not be treated as automatically interchangeable because the applicable load and inflation requirements still need to match the vehicle.

P245/45R17 Size Quick Specs

P245/45R17 Dimensions in Inches

The P245/45R17 tire size is approximately 9.6 inches wide, 25.7 inches tall overall, with a sidewall approximately 4.3 inches high. For P245/45R17, 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.

P245/45R17 in Inches: All Measurements

• Overall Diameter: Approx. 25.7 inches
• Section Width: Approx. 9.6 inches
• Sidewall Height: Approx. 4.3 inches
• Rim Diameter: 17 inches
• Circumference: Approx. 80.7 inches

P245/45R17 Alternative Tire Sizes

Drivers researching alternatives to P245/45R17 compare P245/40R17 and 255/45R17. P245/40R17 keeps the same nominal width but uses a shorter sidewall, and its overall diameter falls outside the commonly used ±3% guideline, making it generally unsuitable as a direct size swap. 255/45R17 adds section width and has a relatively close overall diameter, but that alone does not establish interchangeability. The ±3% tire-size guideline is only a starting point when comparing P245/45R17 alternatives. 

P245/45R17 vs P245/40R17

P245/40R17 is approximately 3.76% smaller in overall diameter than P245/45R17, placing the comparison outside the commonly used ±3% diameter guideline.

• Width Difference: P245/40R17 and P245/45R17 have the same nominal 245 mm section width.
• Diameter Difference: P245/40R17 is approximately 1.0 inch smaller in overall diameter than P245/45R17, a difference of approximately 3.76%.
• Interchangeability: P245/40R17 falls outside the commonly used ±3% guideline and is generally not recommended as a direct size swap for P245/45R17. A larger diameter change can affect speedometer accuracy, vehicle clearance, and vehicle systems calibrated around the original tire diameter.
• Practical Difference: P245/40R17 keeps the same nominal width as P245/45R17 but has a shorter sidewall and a smaller overall diameter.

P245/45R17 vs 255/45R17

255/45R17 is approximately 1.38% larger in overall diameter than P245/45R17, so the diameter difference is within the commonly used ±3% guideline.

• Width Difference: P255/45R17 is 10 mm wider than P245/45R17.
• Diameter Difference: P255/45R17 is approximately 0.4 inch larger in overall diameter than P245/45R17, a difference of approximately 1.38%.
• Interchangeability: The 255/45R17 diameter difference falls within the commonly used ±3% guideline, but this alone does not confirm interchangeability with P245/45R17. Wheel width, load capacity, clearance, and vehicle requirements must still be checked.
• Practical Difference: P255/45R17 is wider and slightly taller overall than P245/45R17, so the main dimensional changes are an additional 10 mm of nominal section width and a small increase in overall tire height.