Tyre testing will be carried out at the Japanese and United States Grands Prix Second practice at the Formula 1 Japanese and United States Grands Prix will be extended by 30 minutes. The one-hour session will increase to a more traditional 90 minutes as teams work with official tyre supplier Pirelli on refining next year's rubber. Strict limitations on in-season testing and a packed calendar have conspired to make tyre testing difficult, with a number of changes on the Italian rubber company's wish list. Among them are changes to the front tyres in an effort to dial out some of the understeer which has been prevalent this season. 'The plan is to test mainly compounds,' explained Mario...
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