Depends upon the way you drive on them. When properly inflated and rotated the last user is correct 75,000 to 100,000 miles on average, even on the cheapest set of tires.
Definition of morpheme. : a distinctive collocation of phonemes (as the free form pin or the bound form -s of pins) having no smaller meaningful parts.
In English grammar and morphology, a morpheme is a meaningful linguistic unit consisting of a word (such as dog) or a word element (such as the -s at the end of dogs) that can't be divided into smaller meaningful parts. Adjective: morphemic. Morphemes are the smallest units of meaning in a language.