Shimano Sienna 4000 FD Front Drag Spinning Reel - Shimano

Super Stopper II anti-reverse uses a one-way roller bearing that eliminates back-play. This provides the angler with instant hook setting power.

These bearings have been through the same process as our A-RB bearings, but feature shields on both sides of the bearings that reduce the possibility of salt or sand inhibiting the bearing's rotation.

This feature eliminates wobble during the retrieve by counter balancing the rotor to enhance sensitivity and smoothness. By using computer balancing, an approach similar to car tire balancing, we are able to redistribute the rotor weight to create smooth rotation and eliminate vibrations.

Normal oscillation systems use a constant rotation of the oscillation gear that, when translated to the cam, provides an inconsistent spool speed. This results in line lay that stacks at either end of the spool. By using an oval oscillation gear, we are able to alter the speed of the oscillation cam to provide a consistent spool speed. This results in an even line lay that provides excellent castability and manageability.

Line twist arising from repeated casting and retrieving is reduced by as much as 50% on reels equipped with the Power Roller line twist reduction system. Power Roller's special grooved design assures the line will be wrapped on the spool to minimize unwanted loops and twists during the cast.

The most obvious component of the Propulsion Line Management System is the new Propulsion spool lip design. Through tens of thousands of casting tests and computer simulations it has been determined that this new spool lip design provides longer casting distances than a standard spool lip design while preventing backlashes and wind knots from forming.