What specifically is the question? The chart reads that the Nitrous B cam yields a draw length of 25-28" and to achieve a 60# max draw weight, you'd need a 2H deflection limb.http://www.martinarchery.com/chart/2007chart/nitrous.php
Specifically the Nitrous information.
I have a 45-60pound limb Slayer with a NitrousB cam!
What do the letters and numbers mean?