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Yeah Racing Tamiya TT-02 Aluminum Essential Upgrade Set. This optional aluminum upgrade set is a great start in unleashing your chassis' full potential. The Yeah Racing upgrade set equips the Tamiya TT-02 with aluminum front and rear lower arms, aluminum front knuckles, aluminum rear hubs and ball bearings. These features all add up to give you better handling, reduced flex, increased durability, precise steering, and all-around more efficient chassis performance! Get this great upgrade set and unleash your TT-02 full potential!