By Julien Pretot PARIS, Nov 25 (Reuters) - Teams in the Grand Tours and several other key races will have one less rider from next season in order to improve safety and enhance the spectacle for fans, race organisers said on Friday. Teams in the Tour de France, the Giro d'Italia and the Spanish Vuelta will have eight riders instead of nine and several key races will feature seven-man teams instead of eight-man outfits. The Amaury Sport Organisation (ASO), organisers of the Tour and the Vuelta, RCS, who run the Giro, and Flanders Classics between them own 17 of the 37 World Tour (elite) races, including the top one-day classics. More...