The GPM TT2B025 Alloy Main Shaft is a precision engineered aluminium replacement intended to enhance drivetrain durability in Tamiya TT02 and TT02B models. Its construction focuses on improved stiffness and longevity compared to standard shafts, helping to stabilise torque transmission and reduce drivetrain wear during sustained use. The part is targeted at hobbyists and tuners who want a reliable upgrade without altering basic drivetrain geometry.