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@freddo
^exactly. it depends how they've been stored. Rubber can perish quickly, esp older compounds. Personally if they felt ok between thumb and forefinger, i'd ride them on the track. If i had to guess I'd say they were late-1990's GP supersonic equivalents.
bottom line, they're 20mm so gonna be made for the track. and they're continental so gonna be decent quality. how much did you pay?