TAMIYA 54343 M-CHASSIS LIGHTWEIGHT FREEWHEEL AXLE
Replace with the freewheel axle that is standard equipment on the M chassis and FF03 series. Made of extra super duralumin (A7075) which is both light and strong. The weight is about 1g per one and the weight is reduced by 2g compared to 3g of the normal axle. Moreover since the unsprung weight is lighter it is highly effective and makes the suspension movement lighter.