Dan, the line weight does, indeed, need to match the rod. Most rods are
made to handle a line weight one above or one below the noted rod weight.
Given today's "fast" or stiffer rods, most rods tend to handle a line weight
one over quite well, if not better than that listed on the rod. A 4/5 line
weight rod should handle a 4 weight line (probably a bit stiff) and a 5
weight line and a good possibility a 6 weight line. If you use floating
lines you have more flexibility than using sinking lines, sink-tip lines, or
shooting heads. Castability can change when "over-lining" a rod with these
weights more so than with floating lines. Depending on manufacturer, I
would venture to say you would probably do better with a 5 weight line on
your rod.
--
Wayne
To Fish is Human...To Release Divine!

"Dan" lose wrote in message
...
If it is as crucial as I have been led to believe that the line weight
matches the rod weight, what weight line does one use if a rod described
as
a "4/5" weight?

Dan