104bcd conversion base adopts CNC cutting of aluminum alloy to the accuracy of product useThe 104bcd conversion base is perfectly compatible with the electric bicycle medium transmission engine, v / 36V / 48V 250W 350W 450W 500W 750W motor 104bcd the conversion base material is aluminum alloy material, the hardness is much higher than the original, strong and durable steel chain wheel.The 104bcd conversion base can be used with many mountain bike accessories and can be combined with a variety of configuration options, suitable for XC AM DH multiple routes, city tripCategory: CogwheelPlate tooth: 34-42TUse: Mountain bikes Use: Road bikesUse: Children's bicyclesUse: For BMXModel Number: crankset for mid motor kit104BCD: 4 Chain Ring Bolts104BCD Weight: 40gcolour:blackMaterial:Aluminum Alloysize:about 170mmPackage Contents:1 * adapter plate4 * M5*16 screwsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.