French champion Jeannie Longo set a high...

French champion Jeannie Longo set a high altitude world record in a one-hour trial in Mexico City, bicycling 46.352 kilometers to break her mark--then said she would retire from competition next month.

“This is the last record I expect to set,” said Longo, who holds 11 world records. “Today, everything was perfect.”

Longo, 30, confirmed her previously announced intention to retire in a month, after another race in Paris where she does not expect to set another world record.