13t Single-speed Conversion Kit Reverse Brand XD Driver Single Speed Kit Black. WARNING In order to assure proper installation of all bicycle components that we offer for sale, we highly recommend that your bicycle be taken to an independent professional bicycle repair shop to have the item installed. We cannot be responsible for items that do not arrive at our facility. We are currently unable to accommodate exchanges. These charges are normally collected by the delivering frei. Powered by Solid Commerce The All-in-One Listing, Inventory & Order Management Solution.