One source of frustration with the hub motor disk brake setups has been that the threaded disk adapters have a bolt hole pattern that doesn't match the standard for disk rotors here in North America. If you wanted a larger size rotor or a specific disc you were flat out of luck. Well, we have now had a local CNC machinist produce a custom batch of threaded adapter plates with an industry standard 44mm Bolt Center Diameter (BCD). These can be screwed onto any threaded side cover, or even bolted directly to non-threaded side covers, to bring disk brake compatibility to your vehicle.