Armstrong uses Twitter to announce final Tour

Seven-time Tour de France winner Lance Armstrong announced on his Twitter web site Monday that this year's Tour will his final one.

Seven-time Tour de France winner Lance Armstrong announced on his Twitter web site Monday that this year's Tour will his final one.

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"And yes, this will be final Tour de France. It's been a great ride. Looking forward to 3 great weeks," the 38-year-old American Armstrong wrote.

Realizing his tweet included several mistakes Armstrong then re-tweeted, "Doh, sorry, meant "my" final Tour."

On Saturday, Armstrong begins his bid for an eighth Tour de France title.