Sage 4100-4 R8 Core


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SKU: sag-r8c-4100-4

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Product Description

Sage 4100-4 R8 Core Fly Rod

10’0″ 4-wt, 4-piece rod, case and liner
Unconditional Lifetime Warranty

  • Revolution 8 Technology
  • Silver Pine blank color
  • Slate primary wrap colors with graduated white and grey trim
  • Fuji ceramic stripping guides with hard chrome snake guides and tip top
  • Black rod bag with new cord lock for quicker, easier, cleaner storage
  • Aluminum rod tube with Sage logo medallion
  • 3-6 wt:  sustainable Ziricote wood insert with anodized uplocking aluminum real seat
  • 3-6 wt:  premium flor grade snub-nosed half-Wells grip
  • 5-9 wt:  corrosion-resistant anodized aluminum reel seat
  • 5-9 wt (all models with a fighting butt):  premium Flor grade full Wells grip with EVA fighting butt


  1. The R8 Core 4100-4 is a stellar fishing tool and a specialist nymph angler’s go-to rod in the new R8 lineup. This rod is not a power caster. That does not mean that it is not a powerful and highly capable rod, but it is not a blazing loop slinger. This is a fishing tool with a taper that allows easy access to the lower half of the rod and is among the most complete nymphing rods I’ve held. You can feel the sensation of the line lifting from the water incrementally with this rod. Raise the tip after the lift and effortlessly lay it into the desired position. I like to throw small loops along the length of the line on the water when I mend. This allows me to be more precise with the position of my line when mending, and the R8 Core 4100 handles this as intuitively as any rod out there. I enjoyed line in the air with this rod, but I loved how it performed with line on the water. Roll casting is tremendous and the deep load along the blank of the R8 Core rods is very apparent here. My favorite line was the SA Amplitude Smooth Infinity WF4F. I also cast the Rio Elite Gold and the Rio Perception WF4Fs as well. Loop control is very good and the rod readily threw a more open loop with line speed and power. This rod encourages you to slow down your stroke and smooth out your haul. The stability of the line in the air is tremendous and a core characteristic of these R8 rods. Slow down, keep your stroke medium tempo and feel the control. This model does not have a fighting butt and I found that a heavier reel provided a better balance and also made the overall outfit feel lighter as well. A reel like the Sage Trout Reel 4/5/6 is where I would start on this model. My overall impression was that the R8 Core 4100-4 is a specialized model ideally tuned for fishing all manner of nymph rigs for trout. I did not feel like I wanted to fish a dry or dry dropper with this rod, but I do not believe that to be its purpose. There is Euro style crossover potential here as well. Carrying along a Rio Euro Nymph Shorty or a second reel with Euro line, adds another dimension of versatility to this rod. The soft tip to protect light tippets and the mending focused taper make for a highly specialized nymphing rod and one technical tailwater fisherman should pay attention to.

    Richard Post (Telluride Angler)
  2. This rod is a great dedicated nymph stick. It is not the lightest rod in the 10’ 4wt world but with the proper reel pairing it’s difficult to notice. It has a slightly heavier tip than other rods in the R8 family and therefore favors a slightly heavier fly reel. From a casting standpoint it’s a beautiful overhead caster. You can control your loops well and it is very intuitive. As is typical with all longer trout rods, it’s important to slow down your back cast and wait until you feel the rod tell you when to come forward. This is not as powerful as some other 10’ 4wt rods, but it is a great fishing tool. It has great feel and is a very easy roll-caster. It throws a lot of fly lines well but my favorite is the SA Amplitude Smooth Infinity. This is one of the best nymphing lines out there and pairs wonderfully with the 4100/4 R8 Core.

    Parker Thompson (Telluride Angler)
  3. This is a well-constructed fly rod that fishes high in its line class. After experimenting with multiple fly lines, I found that it casts all of the slightly-heavy lines very well, but standard weight lines such as the SA Trout Taper aren’t enough to load the rod. So, this is a 10’ 4 ½-weight, which, when you think about it, could be very useful. I love it with an SA Infinity Taper, which is half a line weight heavy. The rod flexes progressively from tip to butt, generating plenty of line speed to turn over the leader at short distance and with the stability and low end flex to send a really long cast with confidence and control. This is a great light nymphing stick. If I were fishing it with small dry flies, I would consider overlining the rod with a 5-weight SA Trout Taper or Airflo Tactical Taper. Long fly rods pair best with long-bellied lines because that combination offers tremendous line control advantages when you’re fishing beyond the length of a standard fly line head. With an Infinity Taper, you can roll cast or mend line across the river, tremendously empowering. This model is sensitive enough for pseudo-Euro technique, detecting subtle deep water strikes and protecting delicate tippet.

    John Duncan (Telluride Angler)
  4. What a great rod. I paired it with a Kelly Galloup’s Nymph/Indicator Fly Line (4 weight) and a hatch 4+ reel and it works really well for indicator fishing, swinging wet flies, as well as what I would call modified Euro-nymphing. I bought a T&T Contact II rod a few years ago and after getting this I may honestly sell it, as this is a more versatile fishing tool for the latter. This plus a dedicated dry fly rod (which this is not really good for) is a great pairing. If you’re an east coast fly fisher (I’m in NC) I would recommend this rod for many small mountain streams (think 15 fee across).

    Alex T.
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