Several leading MotoGP riders have expressed concerns over the safety of debutant Christophe Ponnson, who replaces the injured Tito Rabat at Avintia at Misano this weekend.  Rabat suffered a triple-fracture to his right leg in a horror crash at Silverstone last month, and will be sidelined for the foreseeable future following successful “emergency surgery”.  Avintia confirmed on Tuesday Xavier Simeon would take over Rabat's GP17 Ducatis, while CEV Superbike rider Ponnson would take Rabat's place aboard the GP16. 22-year-old Ponnson has no prior MotoGP experience, and Yamaha's Valentino Rossi believes this is “maybe not very safe”. “I also...
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