I built is one from a Cromoly MTB frame . Using the small chainring , the bike spins out around 9 MPH . But that's what I wanted . No speeder , just a cruiser . Makes it easy to tackle the hills getting out of my subdivision .
Not finished with it , need to build some type of crash ring to make the crank/chainring look a little better and add a chain guard . I have a chain guard , I just need to paint it black or red , and attach it . Kirby