245/45R17 Tire Size

All You Need to Know About 245/45R17 Tires

245/45R17 tires are 245 mm wide, with a 45% aspect ratio and a 17-inch wheel diameter, resulting in an overall diameter of 25.7 inches and a sidewall height of 4.3 inches.

This page focuses on the 245/45R17 size and its dimensional and performance characteristics. For passenger load standard specifications and pressure-related behavior, see P245/45R17 tires.

The 245/45R17 size combines a relatively wide section with a moderate sidewall, positioning it between lower-profile performance tires and more comfort-oriented 17-inch configurations.

Compared with a shorter size, such as 245/40R17, the 245/45R17 adds sidewall height and rolling diameter. That change improves ride isolation and impact absorption over uneven pavement, while slightly reducing steering sharpness compared with lower-profile alternatives.

In some listings, this size may appear as P245/45R17, indicating a passenger load standard. While the physical dimensions remain unchanged, load behavior depends on inflation pressure and rating rather than size alone.

245/45R17 Size Quick Specs

• Approved rim width range: 7.5–9.0"
• Width: 245 mm
• Sidewall height: 110.25 mm
• Total diameter: ≈25.7"
• Wheel diameter: 17 in

Note: The calculated overall diameter of 245/45R17 is ≈25.7 inches. Small variations may occur across manufacturers because tread depth and casing design can slightly affect mounted diameter.

245/45R17 Common Vehicle Fitment

245/45R17 is used on midsize sedans and performance-oriented configurations where a balance between ride comfort and handling stability is required. In the U.S. market, it appears both as an OEM fitment and as an upgrade size on:

• BMW 5 Series (selected model years and trims)
• Mercedes-Benz E-Class (specific configurations)
• Ford Mustang (selected trims)
• Chrysler 300 (selected configurations)

Because 245/45R17 increases both width and diameter compared with smaller 17-inch sizes, wheel width, offset, and available clearance should be verified before installation.

245/45R17 Dimensions in Inches

The 245/45R17 tire size measures approximately 9.7 inches in width, 25.7 inches in overall diameter, and has a sidewall height of about 4.3 inches.

The 4.3-inch sidewall provides a balance between flexibility and support. It absorbs road irregularities more effectively than lower-profile sizes while maintaining sufficient lateral stability for controlled handling.

245/45R17 in Inches: All Measurements

• Overall diameter: ≈25.7"
• Width: ≈9.7"
• Sidewall height: ≈4.3"
• Wheel diameter: 17"
• Circumference: ≈80.7"

Most Recommended 245/45R17 Tires

Best tires in 245/45R17 size include:

• 245/45R17 all-season tires: Pirelli Cinturato P7 All Season
• Summer tires in 245/45R17: Continental ExtremeContact Sport 02
• Winter tires in 245/45R17: Continental WinterContact TS830 P
• 245/45R17 set of 4 value-focused options: Hankook Kinergy ST (H735)

Comparison of 245/45R17 With Similar Tire Sizes

Within the 17-inch range, 245/45R17 aligns with mid-height, wide-section configurations. The closest comparisons are 245/40R17 as the lower-profile alternative and 255/45R17 as a wider size that remains close in overall diameter.

Difference Between 245/45R17 and 245/40R17 Tire Sizes

The 245/40R17 is shorter while maintaining the same width:

• Width: identical at 245 mm
• Overall diameter: 245/40R17 is ≈0.96 inches (≈3.7%) smaller than 245/45R17

Because this reduction exceeds the ±3% threshold, 245/45R17 and 245/40R17 are not directly interchangeable. The smaller diameter lowers ride height and increases revolutions per mile, which can affect speedometer accuracy, gearing, and ground clearance.

Difference Between 245/45R17 and 255/45R17 Tire Sizes

The 255/45R17 is wider and slightly taller:

• Width: 255/45R17 is 10 mm wider than 245/45R17
• Overall diameter: 255/45R17 is ≈0.35 inches (≈1.4%) larger than 245/45R17

Since the difference remains within the ±3% range, 245/45R17 and 255/45R17 are generally interchangeable from a rolling-diameter standpoint. The added width increases lateral space requirements, so inner clearance, fender space, and approved rim width should all be checked before use.