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Which dimension does the 16 in 205/55 R16 give?

  • A.The overall diameter of the tyre in inches, measured when it is inflated to its normal operating pressure
  • B.The tread width
  • C.The rim width in inches, which must lie within the range specified by the manufacturer for that section width
  • D.The rim diameter in inches

Answer: D

The number is the nominal rim diameter in inches, which is why the marking mixes metric and imperial units. Rim width is a separate specification not carried in the size marking. The mixed units are a historical accident. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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