Exercise panning camera at various shutter speeds

I took shots at varying speed the results are below. The faster speeds freeze the shot effectively whilst the very sow shutter speeds blurred both the rider and the background.

1/4000


1/2500

1/1600

1/1000

1/250

1/100

1/50

1/40

1/40

1/30

1/20

1/13

1/13

1/3

I think that the most effective shots are those at around 1/50 to 1/30 shutter speed as those convey a sense of motion nicely blurring the background and keeping enough detail in the cyclist.