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Hi, Yes, I the motor comes with a 7-speed freewheel as part of the package so you could use it instead of a spacer and single speed--I suspect you would have to bend the frame though. There are RadRunner owners who bend the aluminum frame's dropout distance to fit the 750W motor w/o shortening...

Not sure if this has been fully answered. I bought a 750W from https://electrobikeworld.com/products/48v-750w-bafang-geared-rear-hub-motor and installed it on a single speed Radrunner (not plus). My original motor had a bent axel, and the threaded side broke. I shortened the axel's shoulder...