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Question

Difficulty: MediumWheels and Tires

Match each standard tire sidewall specification term with its correct measurement description or engineering definition.

  • Section WidthThe linear measurement in millimeters from the outer sidewall to the inner sidewall at the widest point.
  • Aspect RatioThe height of the tire sidewall expressed as a percentage of the cross-sectional width.
  • Load IndexA numerical code corresponding to the maximum load-carrying capacity of the tire at rated inflation pressure.
  • Speed RatingAn alphabetical designation indicating the maximum sustained operational speed a tire can safely maintain.

Answer

Section Width matches the linear measurement in millimeters from outer to inner sidewall; Aspect Ratio matches the sidewall height expressed as a percentage of section width; Load Index matches the numerical code corresponding to maximum load-carrying capacity; Speed Rating matches the alphabetical designation indicating maximum sustained speed capability.
Each tire marking corresponds to an exact metric: Section width specifies the millimeter width across sidewalls; Aspect ratio specifies the sidewall height relative to width as a percentage; Load index indicates maximum safe carrying mass; Speed rating designates the upper continuous velocity threshold.

Step-by-Step Solution

1
Identify the dimensional parameters on standard metric tire sizing codes.
Section width indicates physical tire breadth in millimeters (e.g., 225 in P225/50R17), while aspect ratio indicates sidewall height as a percentage of width (e.g., 50).
Dimensional markings establish the geometric fitment and clearance on wheel rims and chassis components.
2
Identify the service description parameters at the end of the tire size designation.
Load index provides a relative weight rating via a two- or three-digit number (e.g., 94), and speed rating provides maximum sustained velocity via a letter code (e.g., V).
Service descriptions guarantee that the tire meets or exceeds original equipment manufacturer payload and speed safety standards.
3
Associate each term to its specific technical definition.
Each tire specification metric aligns directly with its designated engineering meaning.
Accurate interpretation prevents improper tire selection, blowout risks, and speedometer calibration errors.

Key Concept

Standard Automotive Tire Sidewall Markings and Service Descriptions
Estimated Time:1m 15s
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Topics

Wheels and Tires

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