Volvo V70/XC70 - MICHELIN TYRES - stivvy

About 18 months ago we changed from Pirelli to Michelin Pilot Sport, understanding that road noise would be reduced. Quite right but over this time we have to replace 3 tyres well before due mileage because of side-wall blebs. No damage to wheels or kerbing incidents. Anyone else with similar experience?

Volvo V70/XC70 - MICHELIN TYRES - piston power

Was these blebs an indation rather than a buldge?

Indation is normal, buldge is kerb / wheel damage.

Volvo V70/XC70 - MICHELIN TYRES - stivvy

Bulge on the outside wall in each case. Could be pothole related as we have dreadful roads here in S Oxon. but there is no wheel damage or sign of kerbing apart from the usual scuff marks after 100K! I would have thought such an expensive tyre would be required to cope with most UK road conditions. Double whammy - roads nor tyres "not fit for purpose"?