Rio Mainstream Sinking Fly Line
RIO Mainstream WF-S is a fully sinking, weight-forward fly-line family for anglers who want straightforward control of a fly below the surface. It includes S3 and S6 sinking classes in line weights from 4 to 8. This range allows the line to be matched to lighter or more powerful outfits while also providing a choice of descent for different depths, retrieve speeds and subsurface presentations.
Profile and fishing use
Fully sinking construction means that the whole fly line descends beneath the surface, rather than only a short sinking tip. This helps keep the fly in the selected depth band through more of the retrieve and avoids the upward influence of a floating rear section. The Mainstream taper is intended for uncomplicated casting and controlled-depth fishing, making the profile approachable for anglers who are still developing their handling of a weight-forward line.
- Type: fully sinking WF fly line.
- Sinking classes: S3 and S6.
- Line-weight range: 4 to 8.
- Profile purpose: straightforward casting and depth control.
S3 provides the more moderate descent and suits fishing in a shallower layer or situations where a steadier subsurface presentation is required. S6 is intended to take the line deeper more quickly, reducing the wait before the fly reaches its working depth. These designations identify distinct sinking classes; they should not be read as exact sink rates expressed in units per second.
The forward-biased mass distribution of a WF profile assists with forming a stable loop and transferring energy towards the leader. Once fishing, counting the line down and repeating the same count on later casts offers a practical way to revisit the depth at which takes occur. Retrieve pace, pauses and the angle at which the line is worked can then be varied to adjust the fly's path without changing the line.
Mainstream WF-S is suited to presenting wet flies, nymphs and streamers in lakes, reservoirs and deeper river sections. As the complete line sits below the surface, it must be lifted towards or from the water before it can be recast; a smooth lift and progressive acceleration make that transition easier to manage. Selecting the appropriate line weight and choosing between S3 and S6 gives the angler control over both the cast and the subsequent subsurface presentation.