TAMIYA TT01 Precision Graphite Main Shaft with CNC Alloy Ends GTT025 by GPM  [GTT025]

Technical overview of the GTT025 graphite main shaft

The GTT025 is an aftermarket graphite main shaft assembled with machined alloy end fittings for TAMIYA TT01 transmission assemblies. The design pairs a controlled-stiffness graphite centre section with accurately faced alloy ends to maintain concentricity and repeatable bearing engagement within the original TT01 gearbox envelope.

Compatibility is limited to TT01-style drivetrains and the shaft is intended as a direct replacement that does not modify existing gear geometry. Installation requires seating the shaft into the original holders and securing it with the stock retaining hardware to preserve designed axial positioning and preload relationships.

From a setup perspective the graphite element reduces torsional irregularities while the alloy ends preserve interface accuracy with bearings and gearbox interfaces. It is recommended to verify bearing runout, end float, and seating after initial installation and following break-in runs to ensure consistent torque transmission and predictable drivetrain behaviour.