Tyre blisters on a Mercedes, Circuit de Catalunya, 2018 Link to this image full-size: https://www.racefans.net/2018/03/13/tyre-blisters-shows-f1-teams-are-trying-to-influence-pirelli-vettel/motor-racing-formula-one-testing-test-two-day-4-barcelona-spain-283/Tyre blisters on a Mercedes, Circuit de Catalunya, 2018Advert | Become a RaceFans supporter and go ad-freeTyre blisters on a Mercedes, Circuit de Catalunya, 2018