She might be the greatest female cyclist in U.S. history, a two-time Olympic time trial gold medalist and world champion who has inspired an entire generation of riders. Given everything she juggles, it was hardly a surprise when Kristin Armstrong announced her retirement for the second time after the London Olympics. ''She still had that fire burning inside her,'' explained Nicola Cranmer, her longtime friend and the general manager of Armstrong's Twenty16 Professional Cycling team. More...