This is an experimental study of segmental durations as a function of lexical stress production and syllable structure in Greek. In accordance with a production experiment, the results indicate that lexical stress production has different effects on different syllable structure constituents. Thus, the vowels are lengthened more than prevocalic consonants whereas stress production has a shortening effect on postvocalic consonants. These results imply that vowels are the main carriers of stress distinctions in Greek with reference to duration correlates of stress production.