These are a staple in the field of 1000W Direct Drive Hub Motors. They have been produced for a long time and MXUS makes a great product with these XF40 motors. Copied over the years from other companies, these still hold their own.

Standard winding, tops out at approx 45km/hr with a 26'' wheel and 48V battery. Capable of much more power with Statorade and Hub Sinks.

Intended for 135mm rear dropouts, and freewheel gearsets.

DDR-40 1000w (mxusebikekit.com)