My 40t rear sprocket will be here today. I do not have a sprocket on the spindle at the cranks or on the right side of the rear hub. I have no need to pedal the bike easily takes off from a dead stop. Mu thought was adding another chain and sprockets on the right side is just extra weight that imo that's not needed so I just use the pedals to rest my feet on. But I figured out what I'll be doing for the rear brake since I do not have a sprocket there and I already have the thread on disk brake adapter for the threaded freewheel hub. And disk brake caliper adapters to mount the brake calipier on the other side. Then I would like to get dual hydraulic brakes lines to one brake lever I have front and back hydraulic brakes but they are two different systems and have not a clue on how to line them together. I've never even bleed bicycle disk brakes. So yeah. I don't necessarily need the rear brake but with the speed that thing goes I want to have it available