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Shimano Glossary
Home  > Service  > Glossary  > Reel Terms A-O
Aero Wrap II
Aero Wrap II is a worm gear oscillation system with a specially designed pitch to create optimal oscillation speeds for the Propulsion Spool Lip design. It provides uniform line lay and winding shape to prevent loss of energy during the cast while providing longer casts than other oscillation systems. Casting distance is increased with less effort.
Aero Wrap II
A-RB
The Shimano A-RB is a new generation of bearings, resistant to both oxidisation and corrosion. An integrated highly corrosion resistant surface protects the metal from contact with corrosive agents. This enables much harder steels to be used ensuring increased strength and improved durability. A-RB bearings are 10 times more durable than standard bearings making our reels perform stronger for longer.
ARBlogo
Assist Stopper
Assist Stopper is a back-up anti-reverse system, which consists of the traditional pawl and ratchet.
Assist Stopper
Baitrunner System
Baitrunner was a breakthrough in big fish angling - a feature that has proved so beneficial that it has become a standard on big fish reels. Baitrunner is a lever located on the rear of the reel that allows the reel to be set so that line is released in controlled free-spool.

Baitrunner System
Cold Forged Spool
These spools are cold forged from aluminium alloy. The cold forging process creates a lightweight spool with increased structural strength and more resistance to abrasion and damage.
Cold Forged Spool
Dartainium Drag
This drag material provides a wider range of drag settings, along with the smoothest Shimano drag performance ever.
Dartainium Drag
Direct Oil Lubrication Port
This feature enables you to directly lubricate the inner workings of the reel without having to take it apart. A small oil-lubrication port can be found on each of the S-system reels which, when removed, enables you to apply manufacturer approved lubricants to the inside mechanism. An easy and efficient way to keep your S-system reel working at optimum performance.
Maintenance Port
Dyna-Balance
Dyna-Balance eliminates reel wobble during the retrieve by counter-balancing the rotor to enhance winding smoothness.
Dyna-Balance
Escape Hatch
By flipping a switch, the sideplate swivels downward, giving the angler quick access to adjust VBS weights. The switch is located in a position that is easy to use, yet remains out of the way to prevent accidental opening. The sideplate is smooth for comfort when palming the reel.
Escape Hatch
Fightin’ Drag
Models with Fightin’ Drag have both a conventional drag and an additional drag that can be accessed by simply shifting the conveniently located lever to the left or right.
Fighting Drag
Fluidrive II
Fluidrive brings the highest tolerances and the utmost control in the gear cutting process. Fluidrive II features a large master gear polished using a wrapping process, which makes for more efficient retrieves.
Fluidrive II
Floating Shaft II
The key friction area on most fixed spool reels is where the spool drive shaft meets the opinion. Shimano designers have overcome this by reducing a large percentage of surface area contact and incorporating bearings on either side of the shaft. The resultant design leaves the shaft in a ‘floating’ position, considerably improving efficiency and longevity.
Floating Shaft II
High Efficiency Gearing
High Efficiency Gearing is a combination of larger drive and pinion gears, one-piece frame, setplate and sideplate, which eliminates flex in the drive train that can cause gears to bind under pressure.
High Efficiency Gearing
Hybrid Aluminium Body
This combination of aluminium and XT7 graphite retains maximum strength exactly where required.
Hybrid Aluminium Body
Hyper Gear
This precision-engineered main gear transmits more power from the handle to the rotor. Designed to exacting tolerances, it requires less effort but returns more retrieve/playing torque with vastly reduced component wear. In fact, all reels offer a breathtaking 90.3% efficiency, which makes them not only feel great, but in years to come they’ll still be quietly purring.
Hyper Gear
Lever Drag
Lever drag reels are generally used in situations where precise drag control and adjustment are a priority. When fishing live bait or trolling, a lever drag allows you to go from free spool to a pre-determined amount of drag very quickly. Lever drags have a larger drag surface than star drags as the drag washer is about the same diameter as the spool.
Lever Drag
Metal Series
Metal frames have the strength to hadnle the stresses from battling large saltwater fish, and keep moving parts in precise alignment. They also feature the latest anodising techniques for beautiful, corrosion resistant finishes.
Metal Series
Cycling Fishing Snowtech Other
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