F1 drivers threaten to boycott British GP over tire safety . Their association expresses grave concerns over events at Pirelli . five drivers suffered tire failures in the Red Bull . Fernando Alonso says they have to place trust in tire manufacturer Silverstone .
F1 drivers threaten to boycott German GP over tire safety . Their association expresses grave concerns over events at Silverstone . Five drivers suffered tire failures in British Grand Prix . Fernando Alonso says they have to place trust in tire manufacturer Pirelli .