Crossword Genius

Stat for a bike tire (3)

Ross

I believe the answer is:

psi

(Other definitions for psi that I've seen before include "one employed by Socrates?" , "Greek character" , "Greek letter; pounds per square inch (abbrev.)" , "Greek letter; pressure unit" , "Pounds per sq. in. (abbr.)" .)

I've seen this clue in The Washington Post.
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