picked it up new, had it for 2weeks. both front tire hit small pot holes, bubbles where found on both. bmw told me tires should run with 32psi-34psi.( which is why these tires bubbled). i now run them at 36psi front & 37psi in rear, and for the last 5800 miles i have not had a problem. read door spec. which calls for psi, rather then what service rep say..