Chain – To fit Revvi 12″ electric balance bikes

Chain – To fit Revvi 12″ electric balance bikes Two size options depending on your bikes gearing: 11T front sprocket – 55T rear sprocket – This is the gearing for a standard 12″ Bike. 13T front sprocket – 47T rear sprocket – This size can be used if you want to fit a 250w brushless upgrade kit to a 12″ bike.