The duo did not look back as the gap with the peloton went past the six-minute mark, and Sorensen went solo 5.5 km from the line.

Today's 13th stage will take the peloton over 209 kilometers to Colmar with the tricky ascent to the Col du Platzerwasel on the menu.

Earlier, the International Cycling Union overturned an earpiece ban set for today's stage, meaning riders will be able to race with electronic radio equipment as normal.

Tuesday's 10th stage was held without earpieces as an experiment, and a majority of riders and sports directors flayed the measure as being too dangerous.

"To put an end to the controversy which is compromising the running of the Tour de France, the (UCI) Management Committee has decided not to repeat the experiment of a stage without radio communication," the UCI said yesterday.

However, the earpiece ban could be experimented with again at a future race. "The UCI pursues the debate on the appropriateness of using radios during racing and will continue to consult all those involved in cycling as far as their use is concerned," the UCI said.

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