If you want a cleaner connection between motor and wheel, the Tamiya 89928 Geared Motor Hub Shaft is a compact upgrade that helps deliver smoother rotation and better stability for F103 wheel setups. It is aimed at hobbyists tuning setups for consistent on-track behaviour.
The Tamiya 89928 is made to fit F103 wheels and installs without complex modification, offering a straightforward route to improved drivetrain feel. The set is supplied as a matched pair of hubs so you can swap both sides for balanced performance and longer service life when used correctly.
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