Will those mass-produced/available 2.4L and 3.7L aluminum motorized, gas-tank frames have room for a rear 20" fat tire wheel (4")? With disc brake rotor. I don't have access to the parts at this time to do measurements. I know the frames target 26" wheels, but I figured if I go with disc brakes, I just have a smaller circle. Would try to install cranks from a 20" bike, or worse case pedal carefully if I have to pedal. But would the a fat tire have room if it was 3" lower than a 26" wheel in the frame? Thanks.