Features:It is important to have the correct gear ratio for the tire size for proper operation of your clutch or torque converter.A improper gear ratio will make the clutch or belt slip and cause damage to the unit very quickly.To determine the gear ratio necessary for your go kart or mini bike you must know the limit of your top speed.When using a clutch to drive your go kart the top speed on flat terrain is 35mph, if the terrain is hilly or the weight of the driver is high the top speed should be 25mph.Mini bikes work best with a top speed of 25mph for all terrain.When using a torque converter with a go kart you may go as high as 45mph on flat terrain and 35mph on hilly terrain.For mini bikes 35mph is the top speed when using a torque converter.Specification:Material :Metal Item Type :V-belts- & V-rib Belts Special Features : 3/4″ bore Centrifugal Clutch With Pulley 3/4″ Bore3/16″ Key wayPulley accommodates 1/2″ ABS Belt StyleDescription:Use our calculator below to determine the top