All responses are accurate and I hope, helpful. In my experience, a 13' 6" rod is more useful as a Skagit type tool and as such matches best with the lighter range of Skagit heads usually 75 grains lighter if you want to fish with a floating tip or slightly subsurface presentation- 475- 525 Skagit head and a 15' floating tip. If one fishes t-11 or t-14 in 10 - 15' lengths, you use a Skagit head 550- 575. I have used polyleaders from Airflo and Rio only with Scandi heads which should be 10- 15 % lighter than the Skagit heads mentioned above... A fisherman just needs to follow these simple guidelines and figure out what works best. I have found the guidelines I speak of to be reliable in most situations. Hope this is helpful info.. I think it is in synch with what others have said...