how to remove a bike sprocket

{"cid":"91190770","title":"Entry Level BMX Freestyel Bikes , Mens Trick Bikes High Durability","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/c5\/4f\/4a1999255d3df05f5d46d9d51179-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"OEM","Model Number":"SHOWKE - 1","Minimum Order Quantity":"50 UNITS","Delivery Time":"75 Days","Place of Origin":"China","Payment Terms":"L\/C, T\/T","Supply Ability":"10000 Units Per Month","Packaging Details":"5 ply carton box for export","Frame Material":"Steel","Fork Material":"Steel","Rim":"Alloy double wall","Wheel Size":"20\"","Net Weight":"12KGS","Gross Weight":"15KGS","Product name":"BMX Freestyle Bikes"}}