Theory of the KR Concept

Introducing Fuji’s new KR CONCEPT.

Evolution of the New Guide Concept.

Unlike The New Guide Concept which deals with ideas that are universally applicable using many different guides, Fuji’s new KR CONCEPT is made possible in part because of particular design features of Fuji’s new K-Series guides and deals primarily with placement and sizing of new K-Series products. New K-Series guides for the KR CONCEPT are the result of extensive research to answer certain questions posed by the sudden popularity of smaller, lighter guides.

As they did with the development of the New Guide Concept, Fuji engineers posed a hypothesis concerning smaller guides and braided line and then set about to prove or disprove the theory with hard research provided by extensive experimentation.

Though many hypotheses were tested, the following points were proven in testing and form the core principals of the KR Concept.
  1.  Many of the principals of the New Guide Concept hold true in the development of a new evolved concept. Guide position based on the upsweep angle of a spinning rod, for example, is still very important in a successful reduction train layout. Running train layout with respect to Static Loading follows New Guide Concept parameters with only minor changes usually brought about by the lower height of smaller guides.
  2.  Guide height becomes the single most important factor in small-ring reduction trains. KR Concept uses new high-frame, small ring K-Series guides to successfully control line through much smaller rings provided the ring is at a proper height to handle line flow. This new information is counter to the longstanding idea that spool diameter is a key factor in determining ring size of various reduction train spinning guides.
  3.  Smaller ring sizes in strippers and reduction train guides leads to better line control. Added control aids in moving the line down and near the blank earlier, effectively moving the choke point closer to the reel. Moving the choke point toward the reel eliminates the need for a forth reduction guide and instead requires an additional running guide. The addition of a single running guide improves sensitivity, power, recovery and casting distance since the line is flowing smoothly along the blank earlier in the cast. Fuji has named this process “Rapid Choke” and it has a notable impact on rod performance.
  4.  The design of K-Series guides enhances the effect of “Rapid Choke” due to the 30-degree slope of the frame and ring. Fuji engineers do not claim that the slope makes Rapid Choke possible, only that the downward facing ring enhances the effect and contributes to overall performance. Because of this effect, Fuji has chosen to expand the K-Series product line as the guide frame of choice for KR CONCEPT layouts.
  5.  Adding a running guide (and sometimes two) moves mid-rod stress from larger reduction guides to smaller micro guides now positioned in the mid section of the rod. To handle these larger loads, Fuji has developed the KB guide, a small ring guide with a larger, beveled foot specifically designed to handle mid- section stress.
  6.  Research by Fuji indicates a point where smaller rings have no additional benefit and can actually create problems. For that reason, Fuji’s smallest guide recommendation for any rod is a size 4, with sizes 5 and 5.5 recommended for heavier rods and saltwater applications. These recommendations are the best compromise with respect to overall weight, effect on rod action and potential problems that may occur with smaller rings.

Specific build information will be added to our site as soon as we have a chance to compile and interpret additional information from Fuji and have a chance to review the new K-Series guides that will be part of the KR CONCEPT.

Products made speciically for Fuji's new KR CONCEPT: KL-H, KB, KT

  • KL-H guides feature the same sloped ring as other tangle-free K-Series guides but the smaller ring sits atop a much higher frame. For example, the bottom edge of a 20mm KL-H is equal to the bottom edge of a 30mm SV. KL-H is available in 5.5, 8, 10, 12, 16, 20, and 25mm ring sizes
  • Fuji’s new KB solves an emerging problem; most micro running guides do not have the foot strength to stay put in the mid-section of rods due to large stresses in this area when under load.  KB has an over-sized, beveled foot for excellent load characteristics even on heavy rods.
    Available in 4 and 4.5mm rings
  • KT is the rising favorite of rod builders as a lightweight, very strong tangle free running guide and is recommended as the tip section guide of choice in KR rod layouts. Available in 4, 4.5, 5, 5.5, 6, 8 and 10mm sizes.

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