Most LRR tires have less tread depth. My Mirage's Ensaves were 8/32nd new. The Contis on the wife's Sorento have 7/32nds on one end and 5/32nds on the other. 45k miles on the Sorento, about 7k on the Mirage.
Tread wear ratings reflect the difference, with most of the lowest RR tires simply having less thickness in the tread area thus less energy lost in flexing of the tire.
regards
mech
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