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Compares tire specifications and impact on speedometer accuracy, handling, and fuel economy. Validates tire compatibility.

Formel

Speedometer error = circumference change %

Trinn-for-trinn guide

  1. 1Tire size: width, aspect ratio, wheel diameter (e.g., 225/50R17)
  2. 2Compare rolling circumference changes
  3. 3Speedometer error = circumference change %
  4. 4Check load and speed ratings match vehicle

Løste eksempler

Inndata
P215/60 vs P225/55
Resultat
Diameter +0.8%

Vanlige feil å unngå

  • Not checking load rating change
  • Installing all-season when winter required (safety issue)

Ofte stilte spørsmål

Can I use different tire sizes?

Minor differences (±3%) acceptable; larger changes affect speedometer, odometer, handling.

What happens with larger/smaller tires?

Larger: slower acceleration, improved efficiency but less response; smaller: opposite.

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Innstillinger

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