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Tyre equivalence

Rules to follow

  • Mount tyres 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 tyres with a load index equal to or greater than that of the original tyres
  • Mount tyres with a speed index equal to or greater than that of the original tyres (except for snow tyres. More information)
  • Check to see that rim width and diameter are suitable for the tyre
  • When using different front and rear tyre 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 a MOT test station that the dimensions of the mounted tyres are approved for the use of your vehicle.
  • Equivalency tables

    The below table provides you the tyre widths you can fit compared to the rim width.
    e.g. for an 6" rim, tyres whose width is 175, 185, 195 or 205 can be fitted.

    Equivalency table

    Rim width Minimum tyre width Ideal tyre width Maximum tyre width
    5,0 Inches 155 mm 165 or 175 mm 185 mm
    5,5 Inches 165 mm 175 or 185 mm 195 mm
    6,0 Inches 175 mm 185 or 195 mm 205 mm
    6,5 Inches 185 mm 195 or 205 mm 215 mm
    7,0 Inches 195 mm 205 or 215 mm 225 mm
    7,5 Inches 205 mm 215 or 225 mm 235 mm
    8,0 Inches 215 mm 225 or 235 mm 245 mm
    8,5 Inches 225 mm 235 or 245 mm 255 mm
    9,0 Inches 235 mm 245 or 255 mm 265 mm
    9,5 Inches 245 mm 255 or 265 mm 275 mm
    10,0 Inches 255 mm 265 or 275 mm 285 mm
    10,5 Inches 265 mm 275 or 285 mm 295 mm
    11,0 Inches 275 mm 285 or 295 mm 305 mm
    11,5 Inches 285 mm 295 or 305 mm 315 mm
    12,0 Inches 295 mm 305 or 315 mm 325 mm
    12,5 Inches 305 mm 315 or 325 mm 335 mm
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