Associated 3 Gear

Team Associated has released a new B5M 3-gear transmission that provides the spec class racer with a lightweight/low rotating mass option to improve drivetrain efficiency. It also features a new, smaller, lightweight top shaft which uses smaller diameter bearings (5x10x4mm, #91560) for additional weight savings. The 3-gear transmission is also a great tuning aid for modified class racing on high-grip tracks because the gyroscopic effect of the motor is reversed, making the car stay flatter in the corners.

Source: RC10.com