Toro Rosso also blame mid-year tyre switch for dip in fortune 21 October, 2013 James Key Yet another team has claimed its competitiveness in 2013 was affected by Pirelli’s mid-season tyre construction switch. Ferrari and Force India have said that the move from the steel-belted tyres, that ‘exploded’ so spectacularly at Silverstone in June, hurt their form. Toro Rosso technical boss James Key said: “The greater deformation of the tyres was the main reason we completely changed our suspension concept from the STR7 to the STR8. “But since we’ve gone back to the 2012 tyres, the setup window has become smaller, and we can no longer use certain settings that were created specifically for this  car,” he told Auto Motor und Sport. Key said that the tyre switch had also had an aerodynamic effect, with the diffuser no longer “working as well as before”. Indeed, the move from steel to Kevlar internals preceded Toro Rosso dropping behind Sauber in the potentially lucrative Constructors’ World Championship. (GMM) Subbed by AJN. Tweet Related NewsToro Rosso: Disappointing we didn’t bring both cars into Q3Verstappen to make Japan FP1 debut at 16Toro Rosso: Not a bad day for usVergne: I am alone right now with no help from Red BullSainz very upset when Red Bull promoted VerstappenVergne: I have potential to be what Ricciardo isToro Rosso preview Singapore Grand Prix weekendSirotkin and Verstappen set for FP1 sessions this yearVerstappen impressive in first F1 testMercedes would have put Verstappen through GP2 first captain tortuga great.. so now Vettel has 1 WDC, then 2WDC with illigal ride-height control, and now another one due to unfair tyre-advantage.. and people wonder he is not considered one of the ‘greats’ ..xD Spanky Who would the teams blame if F1 had a real tyre supplier?