Heck, that's only a point guard frame, not even big enough for a two guard to ride. A 64cm frame with conventional geometry is actually only properly sized for someone around 6'4". Anyone 6'5" and over for a 64cm frame would need a pretty aggressive saddle to handlebar drop to ride a frame that small.

Bill Walton was 6'11" and wouldn't have been able to ride that anymore than someone who rides a 59cm could ride a 49cm. I'm 6'6" and ride a 68.5cm.

You wanna see a big bike? How 'bout Yao Ming's custom Gunnar (those are 29er rims, the same height as 700c).