The Tamiya 84041 - TRF801XT universal shafts are engineered to reduce rotating mass on the TRF801XT chassis. Dropping the prop shaft diameter from 4.2mm to 3.4mm brings each shaft down from 35g to 29.5g, delivering a total saving of 22g across four shafts and helping the car feel livelier under acceleration.
Lowering the mass of rotating parts reduces angular inertia, which can give better turn-in and more immediate drive out of corners. These shafts are a sensible, low-risk tweak for racers and club drivers who tune weight distribution and gearing for lap time gains.
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