1.With this product, you can easily convert ordinary bicycles to electric bicycles. This is hundreds of dollars cheaper than buying a new electric bike. There is no need to replace your bicycle, only one wheel needs to be replaced. It takes only 1-2 hours for one person to complete the modification. We provide you with a controller bag for free! We put the installation instructions in the packaging. 2.48V 1000W Powerful brushless gearless wheel motor with maximum speed 40km/h. The open size of the Front fork is 100mm.48V 1000W motor speed is 325-331RPM, torque is 57.5-59 N.M. This will provide you with a strong forward momentum. 3.The maximum load capacity of electric bicycles is 150-250 kg. Double-walled alloy wheels with reinforced stainless steel spokes for extra tension. 4.KT- LED900S Made of high-quality plastic, high strength and abrasion resistance, durable. 19 LED light bar for speed display, with 6 km / h acceleration function / under voltage display. Four intelligent electronic volume indicators / five-speed imitation torque assist transmission. With headlight switch control function, convenient and practical. An instruction manual is included with the display package. 5.We provide a 12-month warranty for the motor. The warranty period for all other components is 3 months. I am the source manufacturer, if there is after-sale, you will contact the factory directly, it is very convenient.We work hard to ensure that you are satisfied with our services and products.