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.
Morphemes that change a word from one part of speech to another . . . or change the meaning of a word are known as derivational morphemes. Examples of derivational morphemes are un- and -ly in the word unfriendly (Denise E. Murray and MaryAnn Christison, What English Language Teachers Need to Know Volume I, 2011).