What is the top speed hit during a sprint on flat ground in a road race by a professional sprinter, say, someone like Cavendish?
Is there an official record for this and if so who holds it currently?
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The highest speeds on bike similar to road bikes is the 200m track sprint, where the record is 9.347 seconds, for an average of 77kph.
Official record? No. It's simply not something the UCI has tracked nor has there really been an accurate way to track this. This is the first year where the entire peloton will have their data tracked during the Tour. Cycling isn't like Formula 1 where nearly every datapoint is meticulously tracked. The upside of the UCI weight limit on bikes is that most bikes can now easily come in under the limit and this in turn leaves room for the bikes to carry data trackers, power meters and cameras without incurring any perceived weight penalty. Prior to the UCI weight limit you'd rarely see a racer using a powermeter in competition because they added extra weight.