Good lord a 64 cm bike? He must be a giant! I didn't know they made production bikes that big. It is good of you all to give a gift like this. I have a friend who rides a 62, he had a custom builder hook him up with a frame. He's 6'4" and weighs about 290. And he's super fast, I can't keep up with him. He measured his thighs one time and they were 34"!