Re: 20 toothe sprocket?
no you can,t flip it over .... and yes it does freewheel one way . but it only works properly if the brake arm is attached to the frame . The wheel will spin forward without turning your pedals .
if you try to see if it freewheels in the air ... off the bike .. by turning the sprocket , and its not freewheeling , it because turning the sprocket backwards engages the brake .
keep trying to get the 36 on , even if flipping the wheel would work ( which it won't )
20 teeth is way too small for the motor .