IF you study Simon's recommendateions, they don't even make a Grand Spey for 8 wt. I believe thatwith only two exceptions, only 9 wts and above are recommended for these lines The exceptions have a 8/9 ratings or 8/9/10. Since I don't fish an 11 wt, I have concluded that I only need one line of this series to cover my 9 and 10 wts.