If you?re a pro equipment spotter (read ?anorak?) you will probably have noticed the Xentis four-spoke wheel on the front of Jan Ullrich?s time trial bike. And you will have read about how a mechanic fitted it the wrong way round for last year?s Tour of Germany time trial, costing him an estimated 20 watts. Ullrich still won the time trial, but lost the overall win to Levi Leipheimer by 31 seconds.
Independent tests have shown the Mark 1 to be extremely aerodynamic ? when it?s the right way round. We have even seen a test showing that the wheelset (including the rear) is faster than a rear disc/composite front.
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