Discussion
Which quantity does the number 55 represent in 205/55 R16?
Answer: C
Aspect ratio is the section height divided by the section width, so this tyre is 112.75 millimetres tall in the sidewall. A lower number means a shorter, stiffer sidewall. It is not related to the rim diameter. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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