Vettel's victory down to mid-season tire rules change

摘要

London - Red Bull says the design change of Formula 1 's tires mid-season was key to Sebastian Vettel's title success. After eight races this season, Ferrari's Fernando Alonso was 21 points behind the German. But after failures at the British Grand Prix in June the tires were changed, and Vettel won seven out of eight races up to and including the Indian Grand Prix in October.