The comments about the san rensho as ridiculous have nothing to do with the size. 53 might fit someone 5'9. But if the pictured 53 rensho was my size, I wouldn't buy it as a first bike or a main ride.

L@@K AT THE SEAT TUBE ANGLE! That thing is outright insane, it looks almost like a unicycle! 'nuff said.

Maybe it was meant to be used with a thompson setback seatpost. heh heh.