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@J0nathan
Most of the peloton is on 53/39 chainrings and 11-28 cassette. Obviously it depends on wind and the group and how the workload is being shared out, but let's say they are around mid-block in a 16t sprocket. Cadence is rider dependent but probably anywhere from 90 up to 120. In 53x16 at 100rpm gives you 26mph.