Product DescriptionWeld on adjustable jackshaft brackets made in the USA out of 3/16″ steel. This is the perfect kit for a wide range of mini bikes to fine tune and easily change the gear ratio.Laser cut out of 3/16″ steelMust be welded onto frame5/16″ bolts and lock nuts includedWorks with 1.375″ (1 3/8″) OD bearingsDoes not include bearings, jackshaft, or sprocketsRecommended add-ons (not included in kit)Bearings:5/8″ bearings – https://www.gopowersports.com/5-8-id-sealed-bearing-1-3-8-od-common/3/4″ bearings – https://www.gopowersports.com/bearing-3-4-1-3-8od/Jackshaft:5/8″ – https://www.gopowersports.com/5-8-threaded-jackshaft/3/4″ – https://www.gopowersports.com/3-4-jackshaft-not-threaded-19-long/Jackshaft sprockets:5/8″ bore / #35 chain – https://www.gopowersports.com/jackshaft-sprocket-type-b-35-5-8-bore/5/8″ bore / #420 chain – https://www.gopowersports.com/jackshaft-sprocket-type-b-420-5-8-bore/3/4″ bore / #35 chain – https://www.gopowersports.com/jackshaft-sprocket-type-b-35-