Suitable for DIY electric bicycles, making your ordinary bicycle an electric bike. Brushless hub motor, realize noiseless running, make you full enjoy the fun of riding. High strength and efficiency, greatly improving the riding pleasure, suitable for cyclists who like challenges. Suitable for 700C wheel, simple to operation, accompanying with display meter show data.Made of high quality material, which makes it durable and sturdy, with high performance. 1 x Thumb Throttle Clip. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. Post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.