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All You Need To Know About P235/40R17 Tire Size

The P235/40R17 tire size has a 235 mm section width, a 40% aspect ratio and fits a 17-inch wheel, with a calculated overall diameter of approximately 24.4 inches and a sidewall height of approximately 3.7 inches. The P identifies P235/40R17 as a P-metric passenger tire designation. NeoTires also lists the same numerical size as 235/40R17; the two designations share the same nominal dimensions, but their applicable load and inflation requirements should still be checked rather than treating them as automatically interchangeable.

P235/40R17 Size Quick Specs

Dimensions in Inches for P235/40R17

The P235/40R17 tire size is approximately 9.3 inches wide, 24.4 inches tall overall, with a sidewall approximately 3.7 inches high. For P235/40R17, the 17-inch figure means the tire is designed for a 17-inch wheel, while the approximately 24.4-inch overall diameter shows how tall the complete tire is.

P235/40R17 in Inches: All Measurements

• Width: Approx. 9.3 inches
• Sidewall Height: Approx. 3.7 inches
• Wheel Diameter: 17 inches
• Overall Diameter: Approx. 24.4 inches
• Circumference: Approx. 76.7 inches

Comparison of P235/40R17 With Alternative Tire Sizes

Drivers comparing alternatives to P235/40R17 also examine P235/45R17 and P245/40R17, which retain the 17-inch wheel diameter while changing either sidewall height or section width. P235/45R17 is substantially taller and falls outside the usual ±3% overall-diameter guideline, making it a less direct substitute. P245/40R17 stays much closer in overall diameter, but that alone does not make it interchangeable with P235/40R17. Wheel width, load requirements and vehicle clearance still matter; see our ±3% tire-size guide for the checks behind alternative-size comparisons.

P235/40R17 vs P235/45R17

P235/45R17 is approximately 3.79% larger in overall diameter than P235/40R17, so P235/45R17 falls outside the ±3% diameter guideline. The diameter comparison alone does not determine whether P235/45R17 can be used on a vehicle specified for P235/40R17.

• Width Difference: P235/45R17 and P235/40R17 both have a nominal section width of 235 mm.
• Diameter Difference: P235/45R17 is approximately 0.9 inches taller overall than P235/40R17, a 3.79% increase.
• Interchangeability: P235/45R17 falls outside the ±3% diameter guideline compared with P235/40R17. Wheel width, load capacity, clearance and vehicle requirements still need to be checked before considering a change.
• Practical Difference: P235/45R17 keeps the same nominal width and 17-inch wheel diameter as P235/40R17 but has a taller sidewall and larger overall diameter.

P235/40R17 vs P245/40R17

P245/40R17 is approximately 1.29% larger in overall diameter than P235/40R17, so P245/40R17 is within the ±3% diameter guideline. Being within that guideline does not by itself mean P245/40R17 and P235/40R17 are interchangeable on a specific vehicle.

• Width Difference: P245/40R17 is 10 mm wider than P235/40R17.
• Diameter Difference: P245/40R17 is approximately 0.3 inches taller overall than P235/40R17, a 1.29% increase.
• Interchangeability: The overall-diameter difference between P245/40R17 and P235/40R17 is within ±3%, but the approved wheel width, load capacity, clearance, and vehicle requirements must still be verified. Use our rim-width fitment guide to check whether the tire and wheel widths work together.
• Practical Difference: P245/40R17 is wider and slightly taller overall than P235/40R17 while retaining the same 40% aspect ratio and 17-inch wheel diameter.