Welcome to kangteen006! Have a nice day! If it does not match, it will easily damage the machine. Minimum flat fork distance:100mm. Note: while connecting the controller to the wires, please make sure that you connect the right colors to the controller. Otherwise, the controller may be broken. Ebike conversion kit for front wheel. Spokes and aluminum circle. This electric bicycle kit contains everything needed. To be your bike in a hoche performance. Which provides unparalleled performance and reliability. The suits are not waterproof. Please don’t ride in the rainy day. We use the brake cable with a power cord, our clients can use disc brakes. But can not use hydraulic brake. When installing, make sure that the wiring is not reversed. Otherwise, it may damage the product. France, Germany, spain, Italy. Feedback is very important to us. It is impossible to address issues if we do not know about them! Please keep the original box or packaging within 15days since item received. Your satisfaction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it’s non-workdays, please kindly be patient and wait till Monday.