BEIJING (Reuters) -Xiaomi rolled out its new sports utility vehicle in Beijing on Thursday, as the firm best known for smartphones and consumer electronics gears up to further challenge Tesla in the world's largest auto market. Xiaomi launched the YU7 at 13 of its Beijing showrooms and will start taking orders for the vehicle in July. It is keen to repeat the success of the sporty SU7 sedan, which launched last year and has outsold Tesla's Model 3 on a monthly basis since December.