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Mini bike 500 and 858 Series Driven Clutches are two of the most used and efficient Comet torque converter clutches. Both types and replacement parts are available at OMB Warehouse. The 500 Series torque converter system from Comet Clutches allows peak torque input and downshifts automatically to match load requirements. The clutch changes the ratio between the drive and driven pulleys so that the engine can maintain its peak power output. The drive belt has 0.920 in. top width with symmetrical angles. It has quiet dependable operation with field proven performance. Specifications are as follows: 7.5 in. driven - 0.81:1 high, 3:34:1 low ratio, 8.5 in. driven - 1.04:1 high, 3.76: 1 low ratio, 4 cycle-all engines up to 18 hp, 2 cycle 25 hp, Drive clutch bore series – available in 20 and 25 mm as well as 1 in, Driven unit diameter – 7.5 in. dia., 0.75 in. with 1 in. bore, or 8.5 in. dia. with 0.75 in. bore. The 858 driven clutches belong to the 500 series and have specifications of 3/4'' bore and 8-1/2'' diameter. Before ordering Mini bike 500 and 858 Series Driven Clutches from us, check the specifications so that they are a perfect fit for your mini bike.