Michelin recently bought back my tires for 75% of the value. Used it for 60,000km & 3 years when it became unserviceable, bulging center groove/out of shape/broken belt?/no accident. Apparently for yet to be determined root cause.

Tire dealers/distributors/retailers do not profit from warranty claims, they sell tires to make profit. That's why they're not that helpful. I contacted Michelin directly. Then they assigned a sales rep to see me.

u mean wordings on the sidewall? NO. The part of the rubber in contact to the ground has grooves, one groove was bulging -whole circumference.