I have a 51, ride it every day. I,m 6'2" and way over 200 lbs. Put a lard-butt seat on it (http://www.sickntwisteddesigns.net/extralargeseat.html), wide cruiser bars and love it. I bought a 48 monark super deluxe and gonna sell it 'cause it just doesn't ride like my Shelby, not even close...