I Have A Couple Cvt Builds. To My Info There Is Two Models Of The Small Cvt. They Are Almost Identical. They Have The 78mm Clutch And Bolt Up To Many Motors.they Bolt Up To The Titan 4 Stroke And Most Of The Pocket Bike Motors. They Start Out At Approx 7/1 Ratio And Shift Up. They Work Very Good. The Belts Are Long Lasting. Make Sure You Have Heavy Oil In The Little Gear Box By The Sprocket. I Think My Thread Is "cvt Rack Mount". Ron