Rod specificationsThere are several specifications manufacturers use to delineate rod uses. These include Power, Action, Line Weight, Lure Weight, and Number of Pieces.
PowerAlso known as "power value" or "rod weight." Rods may be classified as Ultra-Light, Light, Medium-Light, Medium, Medium-Heavy, Heavy, Ultra-Heavy, or other similar combinations. Power is often an indicator of what types of fishing, species of fish, or size of fish a particular pole may be best used for. Ultra-light rods are suitable for catching small bait fish and also panfish, or situations where rod responsiveness is critical. Ultra-Heavy rods are used in deep sea fishing, surf fishing, or for heavy fish by weight. While the use of designating a rod's power is widespread, there is no fixed standard. Application of a particular power tag by a manufacturer is subjective. Any fish can be caught with any rod, but catching panfish on a heavy rod offers no sport whatsoever, and successfully landing a large fish on an ultralight rod requires supreme rod handling skills at best, and more frequently ends in broken tackle and a lost fish. Rods are best suited to the type of fishing they are intended for.
Action"Action" refers to the responsiveness of the rod to bending force (bending curve), and the speed with which the rod returns to its neutral position. An action may be slow, medium, fast, or a combination (e.g. medium-fast.) Fast Action rods flex most in the tip section. Slow rods flex more towards the butt of the rod.The construction material and construction method of a rod affects its action. Action, however, is also often a subjective description of a manufacturer; some manufacturers list the power value of the rod as its action. A "medium" action bamboo rod may have a faster action than a "fast" fiberglass rod. Action is also subjectively used by anglers, as an angler might compare a given rod as "faster" or "slower" than a different rod.
Line weightA rod is usually also classified by the optimal weight of fishing line or in the case of fly rods, fly line the rod should handle. Fishing line weight is described in pounds of tensile force before the line parts. Line weight for a rod is expressed as a range that the rod is designed to support. Fly rod weights are typically expressed as a number from 1 to 12, written as "N"wt (e.g. 6wt.) and each weight represents a standard weight in grains for the first 30 feet of the fly line established by the American Fishing Tackle Manufacturing Association. For example, the first 30' of a 6wt fly line should weigh between 152-168 grains, with the optimal weight being 160 grains. In casting and spinning rods, designations such as "8-15 lb. line" are typical.A rod's action and power may change when line weight is greater or lesser than the rod's specified range. When the line weight used greatly exceeds a rod's specifications a rod may break before the line parts. When the line weight is significantly less than the rod's recommended range the line may part prematurely, as the rod cannot fully flex to accommodate the pull of a given weight fish. In fly rods, exceeding weight ratings may warp the blank or have casting difficulties when rods are improperly loaded.
Lure weightA rod may also be described by the weight of lure or hook that the rod is designed to support. Lure weight is usually expressed in ounces or grams.
Number of PiecesRods that are one piece from butt to tip are considered to have the most natural "feel", and are preferred by many, though the difficulty in transporting them safely becomes an increasing problem with increasing rod length. Two-piece rods, joind by a ferrule, are very common, and if well engineered (especially with tubular glass or carbon fiber rods), sacrifice very little in the way of natural feel.
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