The extra width can improve wheel fitment and track feel compared to the standard hex

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AXIAL AXI232057 Transmission Shaft Set RBX10 Formula 1 Q32 Parts The extra width can improveAXIAL AXI232057 Transmission Shaft Set RBX10 The Axial AXI232057 Transmission Shaft Set is a genuine Axial replacement part supplying internal shafts for the RBX10 transmission. These shafts keep power transferring smoothly through the gearbox, making this a direct way to repair worn or damaged internals. Genuine Axial replacement transmission shaft set Fits Axial RBX10 For transmission internals Durable construction Direct fit installation