tricycle differential axle,with 4 speed,please see below information, the axle is for large ... 250cc-- 1100cc.Forward Ratio:10:31,15:35,4.66:31,Reverse ratio:4.56:31Weight:50kgcast iron shell,with strong load capacity ... capacity:<=2Tonlength:1040,1280,1350wheel hub Diameter:180.200,220 4 speed transaxle(driving axle)