PERPIGNAN, France — In less than 48 hours, Lance Armstrong will have answered the last unresolved question about his capacity to win an eighth Tour de France: Can he still climb?

The 37-year-old Texan is second overall, but about to face his toughest test in this year’s Tour as the grueling three-week race arrives in the Pyrenees mountains.

“That’s my question mark, that’s your question mark, that’s everybody’s question mark,” Armstrong said. “But we don’t have to wait long until we’ll find out, that’s the good thing.”

Armstrong is again eliciting fear among...

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