The traditional pre TdF 2 week at a remote high altitude training camp helps...While the team must give their where abouts, being isolated helps delay or avoid the testers for a while, and maybe get a litte advance notice of thier arrival.
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"You should already be aware that riding with people who steer with their elbows, stick food to the top tube of their frames and ride around in dick togs is not a great idea." -- Classic1