I have had this set up for about 100 miles and like to say how much i like it. It is a Electra alum. coaster bike with a Staton FD with a Zenoah G430 engine. It has a 1.125 dia. drive roller. Now that the engine is broke in it is running strong. My top speed is 33 mph. but with a little more rpms. to spare. I think 35mph is possible with more time on engine.