Originally Posted by
RubeRad
I'm not suggesting OP could ride them, I'm saying one of them is my bike, and the other is significantly too small to be my bike.
I would say that one of them is marked in error then. I've owned 22 mountain bikes (including the 5 I have now). I haven't ridden any mountain bike is has a 20" frame that is too small nor, for that matter, is too big. Granted I don't have any with wheels larger than 26". 29er could mess up the sizing but for someone who rides a 16" frame, a 29er probably isn't a good idea to begin with.