3/4" - 1" Torque Converter Driver Clutch Assembly for Go-Karts & Mini Bikes Roketa GK-11 Drive Medical tells us that

Drive Medical tells us that this caster replaces the earlier SF9031GT

and a 2-part interior pocket

12-1/2" x 2-1/4" complete rear wheel assembly with straight spokes includes rim

The smoother ride of an air-filled pneumatic inner tube and tire cannot be denied

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3/4" - 1" Torque Converter Driver Clutch Assembly for Go-Karts & Mini Bikes Roketa GK-11 Drive Medical tells us thatIf you're doing a conversion on your favorite go kart or dune buggy, you will need the driver pulley that properly matches the diameter of your horizontal engine drive shaft, either a 3 4" or 1" Commonly used on go karts equipped with 6. 5 Hp 196cc to 212cc GX200 style Honda Clone engines, including models from Baja Motorsports, Hammerhead, Manco (Dingo), Murray, and Yerf Dog. This torque converter driver clutch is what is known as a Series 30 clutch