Rocket # 219 Chain Mini Sprockets for Use with Rocket Sprocket Mini Hub. Many karts have rear cross tubes in the chassis that do not accommodate standard sprocket carries for clearance For 4 cycle engines. The mini hub sprocket carrier can be used instead with the smaller sprocket sizes. OTK cadet chassis and many other euro chassis and many other issues when switching from 2 cycle outboard drive to in board drive. The Mini sprockets only fit the mini Hub
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