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@gbj_tester
There are lots of things the rider won't notice which the timekeeper can measure. Each second in a 25 mile TT at middlemarker pace is 0.03% change in speed, far below the measuring ability of any power meter, let alone the much less sensitive seat-of-the-pants. Track sprints can be won or lost by a tyre's width, which is 0.01% of the timed distance.