HEG: High Efficiency Gearing

HEG consists of not only the gears, but also the frame, setplate, and handle-side sideplate. First, Shimano increased the size of the drive gear and the pinion gear to offer increased leverage and power. By using a one-piece frame that incorporates the setplate and adding a one-piece stamped sideplate, Shimano has eliminated flex in the drivetrain that causes normal gears to bind under pressure. By eliminating the flex and increasing the leverage, Shimano is able to provide high-speed retrieves and deliver an incredible amount of torque, while maintaining the smooth, silent retrieve Shimano reels are famous for.