The arrow selection chart has 3 different pictures representing soft, medium, and hard. Under the soft cam it says, IBO up to 260fps. Medium says IBO 261-290 fps and single or hard cam says IBO 291fps up. I did not realize that before but I think I get it now. The Trykon would be a hard cam simply because its IBO is 291 & up?

Heres a link to a PDF selection chart.

http://www.sportsmansguide.com/resource/easton/easton_chart.pdf