NEW YORK—Lance Armstrong won his first seven Tour de France titles with Johan Bruyneel as his team director. No way would he try for No. 8 without him.

Armstrong said Wednesday he will ride for Bruyneel’s Astana team as he seeks to win the 2009 Tour and will compete in the Tour Down Under in Adelaide, Australia, in January.

“While we looked at other teams and talked to other teams, as a friend and as a longtime partner and as somebody that really trusts Johan on every little decision in the program, I could not ever imagine racing against him or racing without him,” Arm...

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