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Which reading in the marking 205/55 R16 91V gives the section width?

  • A.91, which is a coded value from which the width may be obtained by reference to the manufacturer's table
  • B.205, in millimetres
  • C.55, which expresses the width as a percentage of the diameter of the wheel upon which the tyre is fitted
  • D.16

Answer: B

The first number is the nominal section width in millimetres measured at the widest part of the inflated tyre. Fifty five is the aspect ratio, sixteen the rim diameter in inches and ninety one the load index. Each element has its own meaning. Checking which component actually carries the load settles most questions of this kind at once. The shared behaviour explains why these belong together and the differences explain why both exist. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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