30636 bike assist products are offered for sale by suppliers on Alibaba.com, of which electric city bike accounts for 31%, electric hybrid bike accounts for 21%, and electric bicycle kit accounts for 5%.
A wide variety of bike assist options are available to you, such as aluminum, aluminum alloy and steel.You can also choose from lithium battery, lead-acid battery bike assist,as well as from down tube, rear carrier, and integrated battery bike assist, and whether bike assist is disc brake, v brake, or front and rear wheel v brake.