Tamiya 89903 Mechanical Racehorse Finished Model - STEM Series Educational Display  [89903]

Model summary and learning focus

The Tamiya Mechanical Racehorse finished model is part of the STEM Series and serves as a hands-on visual tool to explore basic mechanics. This pre-assembled piece removes complex build steps so hobbyists and learners can focus on observing movement and gear interaction.

Mechanics and movement

The model uses a distinctive arrangement with smooth rollers on the front and grip pads on the rear legs to balance motion and traction. The rear grips are adjustable so you can tune contact for different surfaces, and the link rod holes on the back legs allow selection between two running styles.

Technical features

Powered by a Type 130 motor with a 16.6:1 gear ratio, the model can climb gentle inclines like those on small junior circuits. The build uses simple screw fittings and clear wiring for straightforward inspection, making it a good starter item for young builders. It requires one R6/AA/UM3 battery, sold separately.