Ferrari’s Sebastian Vettel beat Mercedes’ Lewis Hamilton in final practice at the Monaco Grand Prix.
Pirelli manager Mario Isola said the new tyres would take a lot more speed through the corners, with an improvement of four seconds in lap time.
Lewis Hamilton is chasing a third straight title and fourth overall but trails Mercedes teammate Nico Rosberg by 43 points.
Jules Bianchi died in hospital last July after suffering serious head injuries in a crash at the October 2014 Japanese Grand Prix.
The spectacular Barcelona crash raised questions about whether Mercedes could afford to retain Lewis Hamilton-Nico Rosberg partnership.
Renault made new engine available for Red Bull for Monaco Grand Prix after indications that it could bring a gain of up to half a second a lap.
FIA has ordered the crackdown to prevent accidents and retirements caused by the thin transparent strips getting caught in brake ducts.
Lewis Hamilton and Nico Rosberg refused to take blame for the stunning first lap crash that left both cars out of the race at Spanish Grand Prix.
Four major manufacturers welcomed guarantee of stable rules, and highlighted efforts to reduce costs and performance gaps.
Nico Rosberg has won seven races in a row, while Lewis Hamilton has not triumphed since he won his third world title last October.
Toto Wolff said he was speaking out because some of the abuse directed at Mercedes team could impact on engineers and other employees.
Daniil Kvyat twice smashed into the rear of Ferrari at successive corners, second impact shunting Sebastian Vettel into the wall.
Lewis Hamilton would have had to start from pitlane if a new fuel system had not been flown to Sochi from engine factory at Brixworth.
Formula One drivers fear that aerodynamic changes will instead make it harder for cars to follow and overtake.Lewis Hamilton
Lewis Hamilton started at the back of the grid in Shanghai after experiencing a loss of power during the first phase of qualifying.