Originally Posted by
mriley
I have access to an single speed (3 year old Schwinn Racer - single speed, coaster brakes, not a cruiser)
This is the key word. I, and maybe others, were initially thinking of the Racer from the 60s. This new model is more of a "fixie" type bike except that it has a coaster brake.
Not sure what type of sprocket attachment it uses, you'll need to know at the very least whether it is threaded or splined.