It seems elite cyclists resting heart rate can by < 30. For e.g. "The cyclist Miguel Indurain was reported to have a resting heart rate of just 28 beats per m

It seems elite cyclists resting heart rate can by < 30. For e.g. "The cyclist Miguel Indurain was reported to have a resting heart rate of just 28 beats per minute." (Src: Google search for: elite cyclist resting heart rate)