Tires again, but different

[JERTIGGER2@cs.com]

One of my LBCs has 205-60R-13 tires on it and I will be replacing them.
 Dilemma, I want to go narrower tires but keep the same diameter tire to keep 
the speedometer calibrated.

I was told the 205 represents the tread width in mms. correct? What does the 
second number represent?

TIA
Jerry Rein
73 Midget
72 Lotus Europa TC

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