this looks pretty close to what I am getting at. The Giant Stiletto has a spilt chain chain set up whereby there are two BB axles, one with cranks and pedals and one with a sprocket that tales a second chain back to the cassette. The left hand side of the rear BB is just waiting for a sprocket which I could rig up easy enoughbut it needs to free wheel so when the motor/ clutch is engaged the pedals arent spinning madly. What I am looking for is a 16-20 toothn free wheeling sprocket that will mount to the left side of the BB axle......