Mini-Z MR-03 AWD 21T Precision Alloy Motor Pinion MZA021T by GPM  [MZA021T]

Technical summary of the 21T alloy pinion

This single-piece alloy motor pinion is supplied as a 1pc set for Kyosho Mini-Z AWD cars using the MR-03 AWD motor layout and includes the mounting screw. The 21-tooth count conforms to standard Mini-Z pinion selections and provides a direct replacement or tuning option when changing final drive ratios.

Installation requires seating the pinion on the motor shaft and fastening the included screw, followed by careful verification of gear mesh and axial alignment to ensure optimal tooth contact and minimal backlash. Intended for scale RC applications only.

From a performance perspective, the 21T pinion offers a predictable change to final drive ratio and works in combination with spur adjustments to balance acceleration and top speed for indoor racing conditions. Regular inspection of the tooth profile and screw torque is recommended to maintain consistent drivetrain performance.