Rio Mainstream Type 6 Full Sinking Fly Line

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RIO Products designed the Mainstream fly line series to cater to the average angler looking to expand his/her horizons in the world of fly fishing. The full sinking iteration of the Mainstream series provides anglers with an affordable line option with a short, powerful front head for turning over large streamers on rivers and in lakes. This line is built for anglers with a wide range of casting styles and accommodates most skill levels and angler preferences. If you’re looking to get into streamer fishing or you’re a seasoned angler looking for a simple sinking line, choose the Mainstream Full Sink.



Targeted Audience Design - The Mainstream fly line series from RIO is a line for the beginner/ intermediate angler. RIO designed the line with a short front taper to increase castability and fly turnover. The line also features a thin diameter and durable design for increased sink capabilities and performance that lasts. If you’re looking for a versatile sinking line that’s both affordable and versatile, this is the line for you.



Streamers - As a full sinking line, this version of the Mainstream is meant to be used when fishing streamers in either rivers or lakes. Because it’s a full sink, it can also be used for trolling with fly rods and deep water nymph fishing in lakes. The line’s short front taper helps anglers turn over larger flies and cast in windy conditions.



Cold/Moderate - This line is made to be used in a variety of conditions including freshwater streams and rivers, lakes almost any climate. That being said, this line will turn limp in tropical climates and isn’t meant to be used in high heat.



Short/ Powerful Front Taper - The Mainstream Full Sinking Line is a slightly heavier line for easier all-around performance. As a line that’s marketed to average and novice anglers, RIO made the Mainstream to cater to the widest range of casting styles possible. With a short, aggressive front taper this line is a great option for fast action rods and loads and unloads really easily. The simple design of this fly line makes it caster-friendly and highly efficient on the water.


More Info

Best for: Freshwater, Trout




Sinking/Floating: Sinking


Other Resources

2020 Tropical Saltwater Fly Line Shootout & Buyer's Guide

Fly Line Temps: Tropical Vs. Coldwater

Freshwater Fly Line Shootout & Buyer's Guide





Line WeightLengthHead WeightHead LengthSink RateColorPrice 
WF4S680ft 24.4m120gr (7.8gm)38ft 11.6m6-7 ipsBlack$39.99
WF5S680ft 24.4m140gr (9.1gm)38ft 11.6m6-7 ipsBlack$39.99
WF6S680ft 24.4m160gr (10.4gm)40ft 12.2m6-7 ipsBlack$39.99
WF7S680ft42ft6.0 ipsBlack$39.99
WF8S680ft42ft6.0 ipsBlack$39.99
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