Rules to follow

  • Mount tires with the same exterior diameter (or slightly smaller)
  • The speedometer must not read below the actual speed. When travelling at 25 to 75 mph, the speedometer can read up to 10% more than the actual speed
  • Mount tires with a load index equal to or greater than that of the original tires
  • Mount tires with a speed index equal to or greater than that of the original tires (except for snow tires. More information)
  • Check to see that rim width and diameter are suitable for the tire
  • When using different front and rear tire dimensions on SUVs and vehicles equiped with anti-lock and anti-slip systems (ABS, ASR), the distance travelled over one turn must be taken into account
  • Make sure that any dimension changes you plan to make do not pose mechanical problems (required space, extending beyond the vehicle body...)
  • strong>Check with the manufacturer, the garage, and your insurance company that the dimensions of the mounted tires are approved for the use of your vehicle.

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CAR advice

Warning

This tool shows most of the sizes of original tires. The theoratical equivalent sizes are determined from the outside diametre with a height of -3% to +3% on the upper side of the flank.

This information is intended as an indication only and does not have to be considered as a converting guide.